Denis Helic

Publications

2023

• Niklas Hopfgartner, Michael Auer, Tiago Santos, Denis Helic, Mark Griffiths. Cooling off and the effects of mandatory breaks in online gambling: a large-scale real-world study, International Journal of Mental Health and Addiction, 1-18, 2023.
• Tiago Santos, Florian Lemmerich, Denis Helic. Bayesian estimation of decay parameters in Hawkes processes, Intelligent Data Analysis 27 (1), 223-240, 2023.

2022

• Lisa Posch, Arnim Bleier, Fabian Flöck, Clemens Lechner, Katharina Kinder-Kurlanda, Denis Helic, Markus Strohmaier. Characterizing the Global Crowd Workforce: A Cross-Country Comparison of Crowdworker Demographics, Human Computation, 9(1), 22-57, 2022.
• Niklas Hopfgartner, Michael Auer, Tiago Santos, Denis Helic, Mark Griffiths. The Effect of Mandatory Play Breaks on Subsequent Gambling Behavior Among Norwegian Online Sports Betting, Slots and Bingo Players: A Large-scale Real World Study, Journal of Gambling Studies, 38, 737–752, 2022.
• Niklas Hopfgartner, Michael Auer, Mark Griffiths, Denis Helic Predicting self-exclusion among online gamblers: An empirical real-world study Journal of Gambling Studies, 1-19, Springer, 2022.
• Christian Toth, Denis Helic, Bernhard Geiger. Synwalk: community detection via random walk modelling Data Mining and Knowledge Discovery, 36, 739-780, Springer, 2022.
• Philipp Koncar, Tiago Santos, Markus Strohmaier, Denis Helic. On the application of the Two-Factor Theory to online employer reviews, Journal of Data, Information and Management, 1-23, Springer, 2022.
• Denis Helic, Ujwal Gadiraju, Marko Tkalcic. Editorial: User Modeling and Recommendations, Frontiers in Big Data, 5, 2022.
• Philipp Koncar, Bernhard Geiger, Christina Glatz, Elisabeth Hobisch, Sanja Saric, Martina Scholger, Yvonne Völkl, Denis Helic. A Sentiment Analysis Tool Chain for 18th Century Periodicals, Fabrikation von Erkenntnis: Experimente in den Digital Humanities, 2022.
• Hussain Hussain, Meng Cao, Sandipan Sikdar, Denis Helic, Elisabeth Lex, Markus Strohmaier, Roman Kern. Adversarial Inter-Group Link Injection Degrades the Fairness of Graph Neural Networks, Proceedings of 22nd IEEE International Conference on Data Mining, IEEE ICDM 2022, 975-980, 2022.
• Niklas Hopfgartner, Thorsten Ruprechter, Denis Helic. Retention and Relapse in Gambling Self-help Communities on Reddit, Social Informatics, SocInfo 2022, Lecture Notes in Computer Science, vol 13618, 2022.
• Mathias Uta, Alexander Felfernig, Denis Helic, Viet-Man Le. Accuracy- and consistency-aware recommendation of configurations, SPLC '22: 26th ACM International Systems and Software Product Line Conference, pages 79-84, 2022.

2021

• Hussain Hussain, Tomislav Duricic, Elisabeth Lex, Denis Helic, Roman Kern. The interplay between communities and homophily in semi-supervised classification using graph neural networks, Applied Network Science 6 (1), 1-26, 2021.
• Thorsten Ruprechter, Manoel Horta Ribeiro, Tiago Santos, Florian Lemmerich, Markus Strohmaier, Robert West, Denis Helic. Volunteer contributions to Wikipedia increased during COVID-19 mobility restrictions, Scientific reports 11 (1), 1-12, 2021.
• Niklas Hopfgartner, Michael Auer, Tiago Santos, Denis Helic, Mark Griffiths. The Effect of Mandatory Play Breaks on Subsequent Gambling Behavior Among Norwegian Online Sports Betting, Slots and Bingo Players: A Large-scale Real World Study, Journal of Gambling Studies, 1-16, 2021.
• Mariella Steinkasserer, Thorsten Ruprechter, Denis Helic. Investigating Western Bias in Wikipedia Articles about Terrorist Incidents, Companion Volume to the Proceedings of the 17th International Symposium on Open Collaboration, 2021.
• Mathias Uta, Alexander Felfernig, Viet-Man Le, Andrei Popescu, Thi Ngoc Trang Tran, Denis Helic. Evaluating recommender systems in feature model configuration, Proceedings of the 25th ACM International Systems and Software Product Line Conference, pages 58-63, 2021.
• Mathias Uta, Alexander Felfernig, Denis Helic. Constraint-aware recommendation of complex items, CEUR Workshop Proceedings 2960, 2021.
• Hussain Hussain, Tomislav Duricic, Elisabeth Lex, Denis Helic, Markus Strohmaier, Roman Kern. Structack: Structure-based Adversarial Attacks on Graph Neural Networks, HT '21: Proceedings of the 32nd ACM Conference on Hypertext and Social Media, Pages 111–120, 2021.
• Niklas Hopfgartner, Tiago Santos, Michael Auer, Mark Griffiths, Denis Helic. Social Facilitation Among Gamblers: A Large-Scale Study Using Account-Based Data. 15th International Conference on Web and Social Media, AAAI ICWSM 2021, pages 185--195, 2021.
• Tiago Santos, Keith Burghardt, Kristina Lerman, Denis Helic. Limiting Tags Fosters Efficiency. 13th ACM Web Science Conference 2021}, pages 46--55, 2021.
• Philipp Koncar, Simon Walk, Denis Helic. Analysis and Prediction of Multilingual Controversy on Reddit. 13th ACM Web Science Conference 2021}, pages 215--224, 2021. (Best Student Paper Award)

2020

• Hussain Hussain, Tomislav Duricic, Elisabeth Lex, Roman Kern and Denis Helic. On the Impact of Communities on Semi-supervised Classification Using Graph Neural Networks, pages 15--26, 9th International Conference on Complex Networks and Their Applications, Complex Networks 2020, accepted, Springer 2020.
• Philipp Koncar, Denis Helic. Employee Satisfaction in Online Reviews. International Conference on Social Informatics 2020, SocInfo 2020, pages 152--167, 2020. (Best Paper Nominee)
• Thorsten Ruprechter, Tiago Santos, Denis Helic. Relating Wikipedia article quality to edit behavior and link structure. Applied Network Science, 5(1):61, Springer, 2020.
• Philipp Koncar, Alexandra Fuchs, Elisabeth Hobisch, Bernhard C. Geiger, Martina Scholger, and Denis Helic. Text sentiment in the Age of Enlightenment: an analysis of spectator periodicals. Applied Network Science, 5(1):33, Springer, 2020.
• Matthias Wölbitsch, Thomas Hasler, Simon Walk, and Denis Helic. Mind the Gap: Exploring Shopping Preferences Across Fashion Retail Channels. The 28th Conference on User Modeling, Adaptation and Personalization, 2020, UMAP 2020, pages 257-265, ACM, 2020.
• Tiago Santos, Keith Burghardt, Kristina Lerman, and Denis Helic. Can Badges Foster a More Welcoming Culture on Q&A Boards? 14th AAAI International Conference on Web and Social Media, 2020, ICWSM 2020, pages 969-973, Association for the Advancement of Artificial Intelligence, 2020.
• Tomislav Duricic, Hussain Hussain, Emanuel Lacic, Dominik Kowald, Denis Helic, and Elisabeth Lex. Empirical Comparison of Graph Embeddings for Trust-Based Collaborative Filtering. The 25th International Symposium on Methodologies for Intelligent Systems, 2020, ISMIS 2020, pages 181-191, Springer, 2020.
• Anastasia Klimashevskaia, Bernhard Geiger, Martin Hagmüller, Denis Helic, and Frank Fischer. To be or not to be central - On the Stability of Network Centrality Measures in Shakespeare's Hamlet. Digital Humanities 2020, DH 2020, Book of abstracts, Alliance of Digital Humanities Organizations (ADHO), 2020.
• Matthias Wölbitsch, Thomas Hasler, Denis Helic, and Simon Walk. Show Me the Money: RFID-based Article-to-Fixture Predictions for Fashion Retail Stores 14th IEEE International Conference on RFID, accepted, IEEE, 2020.
• Lukas Eberhard, Simon Walk, and Denis Helic. Tell Me What You Want: Embedding Narratives for Movie Recommendations. 31st ACM Conference on Hypertext and Social Media}, HT 2020, pages 301-306, ACM, 2020.

2019

• Patrick Kasper, Philipp Koncar, Simon Walk, Matthias Wölbitsch, Tiago Santos, Markus Strohmaier, and Denis Helic. Modeling User Dynamics in Collaboration Websites. In Fakhteh Ghanbarnejad, Rishiraj Saha Roy, Fariba Karimi, Jean-Charles Delvenne, Bivas Mitra, Editors, Dynamics On and Of Complex Networks III: Machine Learning and Statistical Physics Approaches, Springer Proceedings in Complexity book series, pages 113-133. Springer 2019.
• Tiago Santos, Simon Walk, Roman Kern, Markus Strohmaier, and Denis Helic. Activity Archetypes in Question-and-Answer (Q&A) Websites: A Study of 50 Stack Exchange Instances. ACM Transactions on Social Computing, February 2019, 2(1), 4:1-4:23, ACM, 2019.
• Tiago Santos, Florian Lemmerich, Markus Strohmaier, and Denis Helic. What's in a Review: Discrepancies Between Expert and Amateur Reviews of Video Games on Metacritic. Proceedings of the ACM on Human-Computer Interaction, Volume 3, Computer Supported Cooperative Work and Social Computing (CSCW'19), Article 140 (November 2019), 22 pages, ACM, 2019.
• Matthias Wölbitsch, Simon Walk, Michael Goller and Denis Helic. Beggars Can't Be Choosers: Augmenting Sparse Data for Embedding-Based Product Recommendations in Retail Stores. The 27th Conference on User Modeling, Adaptation and Personalization, 2019, UMAP '19, pages 104-112, ACM, 2019.
• Tiago Santos, Simon Walk, Roman Kern, Markus Strohmaier, and Denis Helic. Self- and Cross-Excitation in Stack Exchange Question & Answer Communities. The World Wide Web Conference, 2019, WWW '19, pages 1634-1645, ACM, 2019.
• Lukas Eberhard, Simon Walk, Lisa Posch, and Denis Helic. Evaluating narrative-driven movie recommendations on Reddit. Proceedings of the 24th International Conference on Intelligent User Interfaces, IUI '19, pages 1-11, ACM, 2019.
• Philipp Koncar, Denis Helic. Text Sentiment in the Age of Enlightenment. 8th International Conference on Complex Networks and Their Applications, Complex Networks 2019, pages 350-362, Springer 2019.
• Thorsten Ruprechter, Tiago Santos, Denis Helic. On the Relation of Edit Behavior, Link Structure, and Article Quality on Wikipedia. 8th International Conference on Complex Networks and Their Applications, Complex Networks 2019, pages 242-254, Springer 2019.
• Matthias Wölbitsch, Thomas Hasler, Michael Goller, Christian Gütl, Simon Walk, and Denis Helic. RFID in the Wild - Analyzing Stocktake Data to Determine Detection Probabilities of Products Sixth International Conference on Internet of Things: Systems, Management and Security, IOTSMS 2019, pages 251-258, IEEE 2019.

2018

• Alexander Felfernig, Müslüm Atas, Denis Helic,Thi Ngoc Trang Tran, Martin Stettinger, and Ralph Samer. Algorithms for Group Recommendation. In Alexander Felfernig, Ludovico Boratto, Martin Stettinger, Marko Tkalcic, Editors, Group Recommender Systems: An Introduction, pages 27-58. Springer 2018.
• Dimitar Dimitrov, Denis Helic, Markus Strohmaier. Tag-based Browsing and Visualization. In Peter Brusilovski, editor, Social Information Access, pages 181-212. Springer 2018.
• Ilire Hasani-Mavriqi, Dominik Kowald, Denis Helic, Elisabeth Lex. Consensus dynamics in online collaboration systems. Computational Social Networks, December 2018, 5:2, Springer, 2018.
• Massimo Vitiello, Simon Walk, Denis Helic, Vanessa Chang, Christian Gütl. User Behavioral Patterns and Early Dropouts Detection: Improved Users Profiling through Analysis of Successive Offering of MOOC. Journal of Universal Computer Science, August 2018, 24(8), 1131-1150, 2018.
• Dorien Huysmans, Elena Smets, Walter De Raedt, Chris Van Hoof, Katleen Bogaerts, Ilse Van Diest, Denis Helic. Unsupervised Learning for Mental Stress Detection - Exploration of Self-organizing Maps. 11th International Joint Conference on Biomedical Engineering Systems and Technologies, BIOSTEC 2018, pages 26-35, SciTePress, 2018.

2017

• Philipp Singer, Denis Helic, Andreas Hotho, Markus Strohmaier. A Bayesian Method for Comparing Hypotheses About Human Trails. ACM Transactions on the Web, 11(3): 14:1-14:29, ACM. 2017.
• Daniel Lamprecht, Markus Strohmaier, Denis Helic. A method for evaluating discoverability and navigability of recommendation algorithms. Computational Social Networks, October 2017, 4:9, Springer, 2017.
• Simon Walk, Lisette Espín-Noboa, Denis Helic, Markus Strohmaier and Mark Musen How Users Explore Ontologies on the Web: A Study of NCBO's BioPortal Usage Logs. 26th international conference on World Wide Web, WWW2017, pages 775-784, ACM, 2017
• Florian Lemmerich, Philipp Singer, Martin Becker, Lisette Espin-Noboa, Dimitar Dimitrov, Denis Helic, Andreas Hotho, Markus Strohmaier. Comparing Hypotheses About Sequential Data: A Bayesian Approach and Its Applications. Machine Learning and Knowledge Discovery in Databases - European Conference. ECML PKDD 2017, pages 354-357, Springer, 2017.
• Matthias Wölbitsch, Simon Walk, Denis Helic. Modeling Peer Influence in Time-Varying Networks. 6th International Conference on Complex Networks and Their Applications, Complex Networks 2017, pages 353-364, Springer 2017.
• Tiago Santos, Simon Walk, Denis Helic. Nonlinear Characterization of Activity Dynamics in Online Collaboration Websites. 7th Temporal Web Analytics Workshop, Collocated with 26th international conference on World Wide Web WWW2017, WWW (Companion Volume) pages 1567-1572, ACM, 2017.
• Philipp Koncar, Simon Walk, Denis Helic, Markus Strohmaier. Exploring the Impact of Trolls on Activity Dynamics in Real-World Collaboration Networks. 7th Temporal Web Analytics Workshop, Collocated with 26th international conference on World Wide Web WWW2017, WWW (Companion Volume) pages 1573-1578, ACM, 2017.
• Massimo Vitiello, Simon Walk, Rocael Hernandez Rizzardini, Denis Helic,Christian Gütl. MOOC Dropouts: A Multi-system Classifier. Data Driven Approaches in Digital Education: Proceedings of 12th European Conference on Technology Enhanced Learning, EC-TEL 2017, pages 300-314, 2017.
• Massimo Vitiello, Simon Walk, Vanessa Chang, Rocael Hernandez Rizzardini, Denis Helic, Christian Gütl. MOOC Dropouts: A Multi-system Classifier. International Conference MOOC-MAKER 2017, MOOC-MAKER 2017, pages 11-20, 2017.

2016

• Daniel Lamprecht, Kristina Lerman, Denis Helic, Markus Strohmaier. How the structure of Wikipedia articles influences user navigation. New Review of Hypermedia and Multimedia, 23(1): 29-50 2016.
• Ilire Hasani-Mavriqi, Florian Geigl, Subhash Chandra Pujari, Elisabeth Lex, Denis Helic. The influence of social status and network structure on consensus building in collaboration networks. Social Network Analysis and Mining. 6(1): 80:1-80:17, 2016
• Simon Walk, Denis Helic, Florian Geigl, Markus Strohmaier. Activity Dynamics in Collaboration Networks. ACM Transactions on the Web., 10(2):11, 2016.
• Daniel Lamprecht, Markus Strohmaier, Denis Helic. A Method for Evaluating the Navigability of Recommendation Algorithms. 5th International Workshop on Complex Networks and their Applications, Complex Networks 2016, 247-259, Springer 2016.
• Darko Stanisavljevic, Ilire Hasani-Mavriqi, Elisabeth Lex, Markus Strohmaier, Denis Helic. Semantic Stability in Wikipedia. 5th International Workshop on Complex Networks and their Applications, Complex Networks 2016, 379-390, Springer 2016.
• Florian Lemmerich, Martin Becker, Philipp Singer, Denis Helic, Andreas Hotho, Markus Strohmaier. Mining Subgroups with Exceptional Transition Behavior. 22nd ACM SIGKDD Conference on Knowledge Discovery and Data Mining, KDD 2016, 965-974, ACM, 2016.
• Florian Geigl, Simon Walk, Markus Strohmaier, Denis Helic. Steering the Random Surfer on Directed Webgraphs. Accepted at IEEE/WIC/ACM International Conference on Web Intelligence, 2016.
• Daniel Lamprecht, Dimitar Dimitrov, Denis Helic, Markus Strohmaier. Evaluating and Improving Navigability of Wikipedia: A Comparative Study of Eight Language Editions. 12th International Symposium on Open Collaboration, OpenSym 2016, 17:1-17:10, ACM, 2016.
• Stefan John, Michael Granitzer, Denis Helic. Creation of Navigation Hierarchies for Information Networks by Applying Genetic Algorithms. 12th International Conference on Web Information Systems and Technologies, WEBIST, pages 63-74, 2016. (Runner-Up Best Paper).
• Florian Geigl, Kristina Lerman, Simon Walk, Markus Strohmaier, Denis Helic. Assessing the Navigational Effects of Click Biases and Link Insertion on the Web. 27th ACM Conference on Hypertext and Social Media, HT 2016, pages 37-47, New York, NY, USA, 2016. ACM.
• Massimo Vitiello, Simon Walk, Denis Helic, Vanessa Chang, Christian Gütl. Predicting Dropouts on the Successive Offering of a MOOC. EUROPEAN STAKEHOLDER SUMMIT on experiences and best practices in and around MOOCs, EMOOCS 2016, pages 501-508, 2016.

2015

• Simon Walk, Philipp Singer, Markus Strohmaier, Denis Helic, Natasha F. Noy. and Mark A. Musen. How to apply Markov chains for modeling sequential edit patterns in collaborative ontology-engineering projects. International Journal of Human-Computer Studies., 84:51-66, 2015.
• Daniel Lamprecht, Markus Strohmaier, Denis Helic, Csongor Nyulas, Tania Tudorache, Natalya F. Noy and Mark A. Musen. Using ontologies to model human navigation behavior in information networks: A study based on Wikipedia. Semantic Web Journal., 6(4):403-422, 2015.
• Philipp Singer, Denis Helic, Andreas Hotho, Markus Strohmaier. HypTrails: A Bayesian Approach for Comparing Hypotheses about Human Trails. In Proceedings of the 24th international conference on World wide web, WWW2015, pages 1003-1013, New York, NY, USA, 2015. ACM. (Best Paper).
• Ilire Hasani-Mavriqi, Florian Geigl, Subhash Chandra Pujari, Elisabeth Lex, Denis Helic. The Influence of Status on Consensus Building in Collaboration Networks The 2015 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, ASONAM 2015, pages 162-169, 2015.
• Daniel Lamprecht, Denis Helic and Markus Strohmaier. Quo vadis? On the effects of Wikipedia?s policies on navigation. In Wikipedia, a Social Pedia: Research Challenges and Opportunities, co-located with the 9th The International AAAI Conference on Web and Social Media (ICWSM), pages 64-66, AAAI, 2015.
• Dimitar Dimitrov, Philipp Singer, Denis Helic and Markus Strohmaier. The Role of Structural Information for Designing Navigational User Interfaces. 26th ACM Conference on Hypertext and Social Media, HT 2015, pages 59-68, New York, NY, USA, 2015. ACM.
• Martin Becker, Philipp Singer, Florian Lemmerich, Andreas Hotho, Denis Helic and Markus Strohmaier, VizTrails: An Information Visualization Tool for Exploring Geographic Movement Trajectories. 26th ACM Conference on Hypertext and Social Media, HT 2015, pages 319-320, New York, NY, USA, 2015. ACM.
• Daniel Lamprecht, Florian Geigl, Tomas Karas, Simon Walk, Denis Helic, Markus Strohmaier. Improving recommender system navigability through diversification: a case study of IMDb. International Conference on Knowledge Management, pages 21:1-21:8, 2015.
• Florian Geigl, Daniel Lamprecht, Reiner Hofmann-Wellenhof, Simon Walk, Markus Strohmaier, Denis Helic. Random surfers on a web encyclopedia. International Conference on Knowledge Management, pages 5:1-5:8, 2015.
• Martin Becker, Philipp Singer, Florian Lemmerich, Andreas Hotho, Denis Helic and Markus Strohmaier, Photowalking the City: Comparing Hypotheses About Urban Photo Trails on Flickr. 7th International Conference on Social Informatics, SocInfo 2015, pages 227-244, 2015.

2014

• Philipp Singer, Denis Helic, Behnam Taraghi, Markus Strohmaier. Detecting Memory and Structure in Human Navigation Patterns Using Markov Chain Models of Varying Order. PLoS ONE., 9(12), 2014.
• Christoph Trattner, Denis Helic, Markus Strohmaier. Tag Clouds. In Reda Alhajj and Jon G. Rokne, editors, Encyclopedia of Social Network Analysis and Mining, pages 2103-2107. Springer 2014.
• Florian Geigl, Denis Helic. The Role of Homophily and Popularity in Informed Decentralized Search. Proceedings of the 2nd International Workshop on Dynamic Networks and Knowledge Discovery, co-located with the European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases (ECML PKDD 2014), DyNaK 2014, CEUR Workshop Proceedings 1229, 2014.
• Denis Helic. Regular equivalence in informed network search. In 2014 Proceedings of the 37th International MIPRO Convention, Mipro 2014, pages 1088-1093, IEEE, 2014.

2013

• Denis Helic, Markus Strohmaier, Michael Granitzer, Reinhold Scherer: Models of human navigation in information networks based on decentralized search. HT '13 Proceedings of the 24th ACM Conference on Hypertext and Social Media, Page(s), 89-98, 2013.
• Denis Helic, Markus Strohmaier, Weronika Wojcik: Navigational evaluation of breadth first search spanning trees. Information and Communication Technology Electronics and Microelectronics (MIPRO) (2013), Page(s) 998 - 1003 International Convention on Information and Communication Technology, Electronics and Microelectronics, 2013.
• Michael Steurer, Christoph Trattner, Denis Helic: Predicting Social Interactions from Different Sources of Location-based Knowledge. - in: The Third International Conference on Social Eco-Informatics. (2013), Page(s). 8 - 13, 2013.

2012

• Markus Strohmaier, Denis Helic, Dominik Benz, Christian Körner, Roman Kern: Evaluation of Folksonomy Induction Algorithms. ACM Transactions on Intelligent Systems and Technology, ACM TIST, Vol 3, Issue 4, Paper: 74, 2012.
• Seid Maglajlic, Denis Helic: How do Social Networks Influence Learning Outcomes? A Case Study in an Industrial Setting. Interactive Technology and Smart Education, Vol 9, Issue 2, Page(s): 74-88, 2012.
• Denis Helic, Christian Körner, Michael Granitzer, Markus Strohmaier, Christoph Trattner: Navigational efficiency of broad vs. narrow folksonomies. HT2012 Proceedings of the 23rd ACM conference on Hypertext and social media, Page(s) 63-72, 2011.
• Christoph Trattner, Denis Helic, Philipp Singer, Markus Strohmaier:: Exploring the differences and similarities between hierarchical decentralized search and human navigation in information networks. 12th International Conference on Knowledge Management and Knowledge Technologies, I-KNOW2012, Paper: 14, 2012.
• Denis Helic: Analyzing User Click Paths in a Wikipedia Navigation Game, Proceedings of MIPRO 2012, International Convention on Information and Communication Technology, Electronics, and Microelectronics, Page(s): 374-379, 2012.

2011

• Ilire Hasani-Mavriqi, Helmut Leitner, Denis Helic, Hermann A. Maurer: Implementation of a Wiki-based Information and Communication System for Academia Europaea. Journal of Computing and Information Technology, CIT Vol 19, Issue 4, Page(s): 231-238, 2011.
• Christoph Trattner, Denis Helic, Markus Strohmaier: On the Construction of Efficiently Navigable Tag Clouds Using Knowledge From Structured Web Content, Journal of Universal Computer Science, J.UCS Vol 17, Issue 4, Page(s): 565-582, 2011.
• Denis Helic, Christoph Trattner, Markus Strohmaier, Keith Andrews: Are Tag Clouds Useful for Navigation? A Network-Theoretic Analysis, Journal of Social Computing and Cyber-Physical Systems, IJSCCPS Vol 1, Issue 1, Page(s): 33-55, 2011.
• Denis Helic and Markus Strohmaier: Building Directories for Social Tagging Systems. The 20th ACM Conference on Information and Knowledge Management, CIKM2011, Page(s): 525-534, 2011.
• Christoph Trattner, Christian Körner and Denis Helic: Enhancing the Navigability of Social Tagging Systems with Tag Taxonomies. 11th International Conference on Knowledge Management and Knowledge Technologies, I-KNOW2011, Paper: 16, 2011.
• Denis Helic, Ilire Hasani-Mavriqi, Sebastian Wilhelm and Markus Strohmaier: The Effects of Navigation Tools on the Navigability of Web-Based Information Systems. 11th International Conference on Knowledge Management and Knowledge Technologies, I-KNOW2011, Paper: 18, 2011.
• Denis Helic, Markus Strohmaier, Christoph Trattner, Markus Muhr and Kristina Lerman: Pragmatic Evaluation of Folksonomies. The 20th ACM International Conference on World Wide Web, WWW2011, Page(s): 417-426, 2011.
• Ilire Hasani-Mavriqi, Denis Helic, Helmut Leitner, Hermann Maurer: Implementation of a Wiki-based Information and Communication System for Academia Europaea. Proceedings of the ITI 2011, 33rd International Conference on Information Technology Interfaces (2011), Page(s): 193-198, 2011.

2010

• Denis Helic, Christoph Trattner, Markus Strohmaier, Keith Andrews: On the Navigability of Social Tagging Systems. In the Proceedings of The Second IEEE International Conference on Social Computing (SocialCom-2010), Page(s): 161 - 168, Minneapolis, Minnesota, USA, 20-22 August, 2010.
• Christoph Trattner, Denis Helic, Markus Strohmaier: Improving Navigability of Hierarchically-Structured Encyclopedias through Effective Tag Cloud Construction. In the Proceedings of 10th International Conference on Knowledge Management and Knowledge Technologies I-KNOW 2010, Page(s): 363 - 370, Graz, Austria, 1-3 September, 2010.
• Andrea Denger, Michael Maletz, Denis Helic: Social Computing: A Future Approach of Product Lifecycle Management. In the Proceedings of 10th International Conference on Knowledge Management and Knowledge Technologies I-KNOW 2010, Page(s): 451 - 457 Graz, Austria, 1-3 September, 2010.
• Atif Latif, Muhammad Tanvir Afzal, Denis Helic, Klaus Tochtermann, Hermann Maurer: Discovery and Construction of Authors' Profile from Linked Data (A case study for Open Digital Journal). In Proceedings of the Linked Data on the Web Workshop (LDOW 2010), WWW2010 Conference, Raleigh, North Carolina, USA. April 27, 2010, CEUR Workshop Proceedings, ISSN 1613-0073, online CEUR-WS.org/Vol-628/ .
• Trattner C., Helic D.: Linking Related Documents: Combining Tag Clouds and Search Queries, In the Proceedings of the 10th International Conference on Web Engineering, ICWE 2010, Page(s): 486-489, Vienna, July 2010.
• Trattner C., Hasani I., Helic D., Leitner H., Fressel C.: The Austrian way of Wiki(pedia)! Development of a Structured Wiki-based Encyclopedia within a Local Austrian Context, In Proceedings of the ACM International Symposium on Wikis and Open Collaboration, WikiSym 2010, Page(s):(9:1-9:10), Gdansk, Poland, July 2010.
• Trattner C., Helic D., Maglajlic S.: Enriching Tagging Systems with Google Query Tags, IEEE Conference on Information Technology Interfaces, ITI 2010, Page(s):205 - 210, Cavtat, Croatia, June 2010.
• Maglajlic S., Helic D., Trattner C.: Social Networks and eLearning: New Model for Learning at Workplace , IEEE Conference on Information Technology Interfaces, ITI 2010, Page(s): 373 - 378, Cavtat, Croatia, June 2010.
• Hasani I., Portsch C., Trattner C., Kacjan B., Helic D., Maurer H.: Using Wiki for Rapid Authoring of Huge Numbers of E-Assessments, In Proceedings of AACE ED-MEDIA 2010, Page(s): 3046-3053, Chesapeake, VA, AACE.
• Trattner C., Helic D., Korica P., Maurer H.: Click, Click - and an Educational Presentation is Available on the Web, In Proceedings of AACE ED-MEDIA 2010, Page(s): 3932-3938, Chesapeake, VA, AACE.
• Maglajlic S., Helic D.: Integrating E-Learning into Work Processes in Industrial Settings: A Case Study, In Proceedings of IEEE 9th International Conference on Information Technology Based Higher Education and Training, ITHET 2010, Page(s): 151 - 157, Istanbul, Turkey, April, 2010.

2009

• AL-Smadi, Mohammad; Guetl, Christian; Helic, Denis: Towards a Standardized e-Assessment System: Motivations, Challenges and First Findings, iJET, Vol 4 (2009) Special Issue: IMCL2009, 6-12.
• Trattner C., Helic D.: Extending the Basic Tagging Model: Context-Aware Tagging, IADIS WWW/Internet 2009 Conference, pp. 76-83.
• Helic D., Saeed A.U., Trattner C. Creating Dynamic Wiki Pages with Section-Tagging, Workshop on New Forms of Xanological Storage and Function, 20th ACM Conference on Hypertext and Hypermedia, 2009, pp. 18-22.
• Nussbaumer, Alexander; Gütl, Christian; Albert, Dietrich; Helic, Denis: Compentece-based Adaptation of Learning Environments in 3D Space , Track on Virtual Worlds for academic, organizational, and life-long learning (ViWo 2009), IMCL 2009, April 2009, Amman, Jordan, pp. 103-108.
• AL-Smadi, Mohammad; Guetl, Christian; Helic, Denis: Towards a Standardized e-Assessment System: Motivations, Challenges and First Findings, IMCL 2009, April 2009, Amman, Jordan, pp. 44-49.

2008

• Kulathuramaiyer, N.; Zaka, B.; Helic, D: Integrated Copy-Paste Checking: Design and Services, Advanced Learning Technologies, 2008. ICALT '08. Eighth IEEE International Conference on 1-5 July 2008 Page(s):519 – 523
• D. Helic, H. Maurer, B. White: Austria-Forum: A Citable Web Encyclopedia, IADIS International Conference WWW/Internet 2008, pages 19-26

2007

• Denis Helic: Formal Representations of Learning Scenarios: A Methodology to Configure E-Learning Systems, In Journal of Universal Computer Science, Vol. 13, Issue 4, pages 504-531, 2007.
• Denis Helic: Technical Aspects of a Phraseology E-Learning Application, In Erika Krzisnik, Wolfgang Eismann (Editors), Phraseology in Lingusitics and Other Branches of Science, Chapter , pages 339-348, Publisher: University of Ljubljana, 2007.
• Christian Safran, Christian Gütl, Denis Helic: The Impact of Web 2.0 on Learning at a Technical University - A usage survey, In Proceedings of E- Learn 2007, pages 436-443, AACE, Chesapeake, VA, USA, 2007.
• Christian Safran, Denis Helic, Christian Gütl: E-Learning practices and Web 2.0, In Proceedings of ICL, Villach, Austria, 2007.
• Denis Helic: Managing Collaborative Learning Processes in E-Learning Applications, In Proceedings of ITI 2007, Information Technology Interfaces, pages 345-350, SRCE, IEEE, Dubrovnik, Croatia, 2007.
• Denis Helic: Developing an E-Learning Application for Teaching Phraseology in Foreign Languages: Lessons Learned from EPHRAS Project, In Proceedings of MIPRO 2007, Computers in Education, pages 38-43, MIPRO, Rijeka, Croatia, 2007.

2006

• Denis Helic: Technology-Supported Management of Collaborative Learning Processes, In International Journal of Learning and Change, Vol. 1, Issue 3, pages 285-298, 2006.
• Denis Helic: Template-based Approach to Development of Interactive Tests with IMS Question and Test Interoperability, In Proceedings of ED-MEDIA 2006, pages 2075-2081, AACE, Charlottesville, USA, 2006.
• Felix Mödritscher, Victor Manuel Garcia- Barrios, Christian Gütl, Denis Helic: The first AdeLE Prototype at a Glance, In Proceedings of ED-MEDIA 2006, pages 791-798, AACE, Charlottesville, USA, 2006.

2005

• Denis Helic, Harald Krottmaier, Hermann Maurer, Nick Scerbakov: Enabling Project-Based Learning in WBT Systems, In International Journal on E-Learning (IJEL), Vol. 4, Issue 4, pages 445-461, 2005.
• Denis Helic, Hermann Maurer, Nick Scerbakov: A Didactics Aware Approach to Knowledge Transfer in Web-based Education, In Claude Ghaoui, Mitu Jain, Vivek Bannore (Editors), Studies in Fuzziness and Soft Computing, Volume 178/2005, Chapter 9, pages 233-260, Publisher: Springer-Verlag GmbH, 2005.
• Denis Helic, Janez Hrastnik, Hermann Maurer: An Analysis of Application of Business Process Management Technology in E-Learning Systems, In Proceedings of E-Learn 2005, pages 2937-2942, AACE, Charlottesville, USA, 2005.
• Bekim Fetaji, Denis Helic, Hermann Maurer: E-Learning Strategy for South East European University to Enable Borderless Education, In Proceedings of E-Learn 2005, pages 2557-2561, AACE, Charlottesville, USA, 2005.
• Denis Helic, Peter Durco: Aspects of an XML-Based Phraseology Database Application, In The Proceedings of the Third International Seminar on Computer Treatment of Slavic and East European Languages, SLOVKO 2005, pages 99-108, VEDA, Bratislava, Slovakia, 2005.
• Denis Helic: An Ontology-Based Approach to Supporting Didactics in E-Learning Systems, In The 5th IEEE International Conference on Advanced Learning Technologies, pages 174-176, IEEE, Kaohsiung, Taiwan, 2005.

2004

• Denis Helic, Hermann Maurer, Nick Scerbakov: Delivering Relevant Training Objects to Personal Desktop with Modern WBT-Systems, In International Journal on E-Learning (IJEL), Vol. 3, Issue 2, pages 42-50, 2004.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Discussion Forums as Learning Resources in Web-Based Education, In Advanced Technology for Learning, Vol. 1, Issue 1, pages 8-15, 2004.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Knowledge Transfer Processes in a Modern WBT System, In Journal of Network and Computer Applications, Vol. 27, Issue 3, pages 163-190, 2004.
• Dietmar Pfahl, Sonja Trapp, Denis Helic: A Methodology-Driven Software Infrastructure for Work-Based Learning, In Michael Kelleher, Andrew Haldane, Eelco Kruizinga (Editors), Researching Technology for Tomorrow's Learning: Insights from the European Community, Chapter 3, pages 85-95, Publisher: CIBIT Consultants|Educators, 2004.
• Heinz Dreher, Nick Scerbakov, Denis Helic: Thematic Driven Learning, In Proceedings of E-Learn 2004, pages 2594-2600, AACE, Charlottesville, USA, 2004.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Combining Individual Tutoring with Automatic Course Sequencing in WBT Systems, In Alternate Track Papers and Posters of The Thirteenth International World Wide Web Conference, pages 456-457, ACM, New York, USA, 2004.

2003

• Denis Helic, Hermann Maurer, Nick Scerbakov: Reusing Discussion Forums as Learning Resources in WBT Systems, In Proceedings of CATE 2003, pages 223-228, IASTED, Calgary, Canada, 2003.
• Denis Helic, Harald Krottmaier, Hermann Maurer, Nick Scerbakov: Implementing Project- Based Learning in WBT Systems, In Proceedings of E-Learn 2003, pages 2189- 2196, AACE, Charlottesville, USA, 2003.

2002

• Denis Helic, Hermann Maurer, Nick Scerbakov: Aspects of Collaborative Authoring in WBT Systems, In Proceedings of International Conference in Infrastructure for Electronic Business, Education, Science, and Medicine on the Internet, CD-ROM Publication, ISBN 88-85280-62-5, SSGRR 2002w, pages paper 37, SSGRR, LAquila, Italy, 2002.
• Denis Helic, Hermann Maurer, Nick Scerbakov: A User Interface and Knowledge Delivery Solution for a Modern WBT System, In Proceedings of ED- MEDIA 2002, pages 753-758, AACE, Charlottesville, USA, 2002.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Implementing Complex Web-Based Training Strategies with Virtual Classrooms, In Proceedings of E- Learn 2002, pages 426-432, AACE, Charlottesville, USA, 2002.
• Harald Krottmaier, Denis Helic: Issues of Transclusions, In Proceedings of E-Learn 2002, pages 1730-1733, AACE, Charlottesville, USA, 2002.
• Harald Krottmaier, Denis Helic: More than Passive Reading: Interactive Features in Digital Libraries, In Proceedings of E- Learn 2002, pages 1734-1737, AACE, Charlottesville, USA, 2002.

2001

• Denis Helic, Hermann Maurer, Jennifer Lennon, Nick Scerbakov: Aspects of a Modern WBT System, In Proceedings of International Conference in Infrastructure for Electronic Business, Education, Science, and Medicine on the Internet, CD-ROM Publication, ISBN 88-85280-61-7, SSGRR 2001, pages paper 38, SSGRR, L’Aquila, Italy, 2001.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Mentoring Sessions: Increasing the Influence of Tutors on the Learning Process in WBT Systems, In Proceedings of WebNet 2001, pages 515-519, AACE, Charlottesville, USA, 2001.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Knowledge Domains: A Global Structuring Mechanism for Learning Resources in WBT Systems, In Proceedings of WebNet 2001, pages 509-514, AACE, Charlottesville, USA, 2001.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Accesing Best-Match Learning Resources in WBT Environment, In Proceedings of ED-MEDIA 2001, pages 726-727, AACE, Charlottesville, USA, 2001.

2000

• Denis Helic, Hermann Maurer, Nick Scerbakov: Web Based Training: What Do We Expect from the System, In Proceedings of ICCE 2000, pages 1689- 1694, AACE, Charlottesville, USA, 2000.

1999

• Denis Helic, Hermann Maurer, Nick Scerbakov: Introducing Hypermedia Composites to WWW, In Journal of Network and Computer Applications, Vol. 22, Issue 1, pages 19-32, 1999.
• Denis Helic, Hermann Maurer, Nick Scerbakov: Authoring and Maintaining of Educational Applications on the Web, In Proceedings of ED- MEDIA 1999, pages 1792-1797, AACE, Charlottesville, USA, 1999.
• Seid Maglajlic, Denis Helic, Nick Scerbakov: Generating the Web Sites Using Templates and Text-patterns, In Proceedings of ED-MEDIA 1999, pages 1682-1682, AACE, Charlottesville, USA, 1999.
• Denis Helic, Seid Maglajlic, Nick Scerbakov: The HC-Data Model: A New Semantic Hypermedia Data Model, In Proceedings of WebNet 1999, pages 493- 498, AACE, Charlottesville, USA, 1999.
• Seid Maglajlic, Denis Helic, Nick Scerbakov: A Practical Approach to Authoring Hypermedia Composites Used for Web Applications, In Proceedings of WebNet 1999, pages 1336-1337, AACE, Charlottesville, USA, 1999.

1998

• Denis Helic, Nick Scerbakov, Dan Scheridan: Increasing Teaching Productivity with EuropeMMM, In Proceedings of ED-MEDIA 1998, pages 519-524, AACE, Charlottesville, USA, 1998.

1997

• Dietmar Freismuth, Denis Helic, Georg Meszaros, Klaus Schmaranz, Bernhard Zwantschko: DINO - Distributed Interactive Network Objects, In Proceedings of ED-MEDIA 1997, pages , AACE, Charlottesville, USA, 1997.
• Dietmar Freismuth, Denis Helic, Georg Meszaros, Klaus Schmaranz, Bernhard Zwantschko: TALE - Teaching Adaptive Lessons Electronically, In Proceedings of ED-MEDIA 1997, pages , AACE, Charlottesville, USA, 1997.
• Denis Helic, Vanessa Mayrhofer, Nick Scerbakov: A Data Model for Educational WWW Servers, In Proceedings of ED-MEDIA 1997, pages 449-454, AACE, Charlottesville, USA, 1997.