Modeling constructivist teaching functionality and structure in the KBS Hyperbook System. - Nicola Henze; Wolfgang Nejdl; Martin Wolpers (CSCL, 1999)

Adaptive Hyperbooks for Constructivist Teaching. - Nicola Henze; Kabil Naceur; Wolfgang Nejdl; Martin Wolpers (Künstliche Intell., 1999)

OTelosRDF: A Resource Description Format with Enhanced MetaModeling Functionalities Based on OTelos. - Wolfgang Nejdl; Hadhami Dhraief; Martin Wolpers (Semannot@K-CAP 2001, 2001)

Open Learning Repositories and Metadata Modeling. - Hadhami Dhraief; Wolfgang Nejdl; Boris Wolf; Martin Wolpers (SWWS, 2001)

Entwicklung und Implementierung eines modellgestützten Datenrepositories: das KBS-Hyperbook-System. - Martin Wolpers (2001)

An O-Telos Provider Peer for the RDF-based Edutella P2P-network. - Martin Wolpers; Wolfgang Nejdl; Ingo Brunkhorst (SAAKM@ECAI, 2002)

Information Integration in Schema-Based Peer-To-Peer Networks. - Alexander Löser; Wolf Siberski; Martin Wolpers; Wolfgang Nejdl (CAiSE, 2003)

Towards P2P-based information systems for E-learning using semantic web technologies (Keynote Address). - Martin Wolpers (CAiSE Workshops, 2003)

Super-peer-based routing and clustering strategies for RDF-based peer-to-peer networks. - Wolfgang Nejdl; Martin Wolpers; Wolf Siberski; Christoph Schmitz 001; Mario T. Schlosser; Ingo Brunkhorst; Alexander Löser (WWW, 2003)

Super-peer-based routing strategies for RDF-based peer-to-peer networks. - Wolfgang Nejdl; Martin Wolpers; Wolf Siberski; Christoph Schmitz 001; Mario T. Schlosser; Ingo Brunkhorst; Alexander Löser (J. Web Semant., 2004)

PROLEARN: technology-enhanced learning and knowledge distribution for the corporate world. - Martin Wolpers; Guido Grohmann (Int. J. Knowl. Learn., 2005)

Joint International Workshop on Professional Learning, Competence Development and Knowledge Management LOKMOL and L3NCD (Preface). - Martin Memmel; Eric Ras; Stephan Weibelzahl; Daniel Burgos; Daniel Olmedilla; Martin Wolpers (EC-TEL Workshops, 2006)

Professional Learning in Europe and Beyond Structures for Sustainable TEL-Research. - Martin Wolpers; Margit Hofer; Gunnar Martin (EC-TEL, 2006)

Towards Effective Usage-Based Learning Applications: Track and Learn from User Experience(s). - Jehad Najjar; Erik Duval; Martin Wolpers (ICALT, 2006)

Unifying Learning Object Repositories in MACE. - Christian Prause; Stefaan Ternier; Tim de Jong; Stefan Apelt; Marius Scholten; Martin Wolpers; Markus Eisenhauer; Bram Vandeputte; Marcus Specht; Erik Duval (LODE, 2007)

MACE - Enriching Architectural Learning Objects for Experience Multiplication. - Moritz Stefaner; Elisa Dalla Vecchia; Massimiliano Condotta; Martin Wolpers; Marcus Specht; Stefan Apelt; Erik Duval (EC-TEL, 2007)

Tracking Actual Usage: the Attention Metadata Approach. - Martin Wolpers; Jehad Najjar; Katrien Verbert; Erik Duval (J. Educ. Technol. Soc., 2007)

Towards the Combined Use of Metadata to Improve the Learning Experience. - Martin Memmel; Rafael Schirru; Martin Wolpers; Eleftheria Tomadaki (ICALT, 2008)

Modeling vocabularies in the architectural domain. - Katja Niemann; Martin Wolpers (ICDIM, 2008)

CAMera for PLE. - Hans-Christian Schmitz; Maren Scheffel; Martin Friedrich; Marco Jahn; Katja Niemann; Martin Wolpers (EC-TEL, 2009)

Metadata in Architecture Education - First Evaluation Results of the MACE System. - Martin Wolpers; Martin Memmel; Alberto Giretti (EC-TEL, 2009)

Self-monitoring for Computer Users. - Maren Scheffel; Martin Friedrich; Marco Jahn; Uwe Kirschenmann; Katja Niemann; Hans-Christian Schmitz; Martin Wolpers (GI Jahrestagung, 2009)

Exploitation of usage and attention metadata. - Martin Wolpers; Hans-Christian Schmitz (GI Jahrestagung, 2009)

Metadata Representation of Real-World Objects for Architectural Education. - Martin Wolpers; Katja Niemann; Christian Prause (ICALT, 2009)

Analysing Contextualized Attention Metadata for Self-regulated Learning - A Supporting Framework for Self-Monitoring and Self-Reflection. - Maren Scheffel; Frank Beer; Martin Wolpers (CSEDU (1), 2010)

Demands of Modern PLEs and the ROLE Approach. - Uwe Kirschenmann; Maren Scheffel; Martin Friedrich; Katja Niemann; Martin Wolpers (EC-TEL, 2010)

Introducing a Social Backbone to Support Access to Digital Resources. - Martin Memmel; Martin Wolpers; Massimiliano Condotta; Katja Niemann; Rafael Schirru (EC-TEL, 2010)

A Framework for the Domain-Independent Collection of Attention Metadata. - Maren Scheffel; Martin Friedrich; Katja Niemann; Uwe Kirschenmann; Martin Wolpers (EC-TEL, 2010)

CAM in the semantic web world. - Pedro J. Muñoz Merino; Abelardo Pardo; Carlos Delgado Kloos; Mario Muñoz Organero; Martin Wolpers; Katja Niemann; Martin Friedrich (I-SEMANTICS, 2010)

An Approach for the Personalization of Exercises Based on Contextualized Attention Metadata and Semantic Web technologies. - Pedro J. Muñoz Merino; Carlos Delgado Kloos; Martin Wolpers; Martin Friedrich; Mario Muñoz Organero (ICALT, 2010)

Enabling the Use of Real World Objects to Improve Learning. - Katja Niemann; Martin Wolpers (ICALT, 2010)

Analyzing Contextualized Attention Metadata with Rough Set Methodologies to Support Self-regulated Learning. - Maren Scheffel; Martin Wolpers; Frank Beer (ICALT, 2010)

Usage-based Object Similarity. - Katja Niemann; Maren Scheffel; Martin Friedrich; Uwe Kirschenmann; Hans-Christian Schmitz; Martin Wolpers (J. Univers. Comput. Sci., 2010)

Issues and considerations regarding sharable data sets for recommender systems in technology enhanced learning. - Hendrik Drachsler; Toine Bogers; Riina Vuorikari; Katrien Verbert; Erik Duval; Nikos Manouselis; Günter Beham; Stefanie N. Lindstaedt; Hermann Stern; Martin Friedrich; Martin Wolpers (RecSysTEL@RecSys, 2010)

Usage Pattern Recognition in Student Activities. - Maren Scheffel; Katja Niemann; Abelardo Pardo; Derick Leony; Martin Friedrich; Kerstin Schmidt; Martin Wolpers; Carlos Delgado Kloos (EC-TEL, 2011)

Usage-based Clustering of Learning Objects for Recommendation. - Marc-Andre Orthmann; Martin Friedrich; Uwe Kirschenmann; Katja Niemann; Maren Scheffel; Hans-Christian Schmitz; Martin Wolpers (ICALT, 2011)

Aggregating metadata to improve access to resources. - Martin Wolpers; Martin Memmel; Katja Niemann; Joris Klerkx; Marcus Specht; Alberto Giretti; Erik Duval (IRI, 2011)

Usage contexts for object similarity: exploratory investigations. - Katja Niemann; Hans-Christian Schmitz; Maren Scheffel; Martin Wolpers (LAK, 2011)

Dataset-driven research for improving recommender systems for learning. - Katrien Verbert; Hendrik Drachsler; Nikos Manouselis; Martin Wolpers; Riina Vuorikari; Erik Duval (LAK, 2011)

A Novel Approach towards Skill-Based Search and Services of Open Educational Resources. - Kyung-Hun Ha; Katja Niemann; Uta Schwertel; Philipp Holtkamp; Henri Pirkkalainen; Dirk Börner; Marco Kalz; Vassilis Pitsilis; Ares Vidalis; Dimitra Pappa; Markus Bick; Jan M. Pawlowski; et al. (MTSR, 2011)

Developing a Network of Cultural Heritage Objects Repositories for Educational Purposes. - Kerstin Schmidt; Hans-Christian Schmitz; Martin Wolpers (MTSR, 2011)

Early Results of Experiments with Responsive Open Learning Environments. - Martin Friedrich; Martin Wolpers; Ruimin Shen; Carsten Ullrich; Ralf Klamma; Dominik Renzel; Anja Richert; Bodo von der Heiden (J. Univers. Comput. Sci., 2011)

A Comparison of Usage Data Formats for Recommendations in TEL. - Katja Niemann; Maren Scheffel; Martin Wolpers (RecSysTEL@EC-TEL, 2012)

Key Action Extraction for Learning Analytics. - Maren Scheffel; Katja Niemann; Derick Leony; Abelardo Pardo; Hans-Christian Schmitz; Martin Wolpers; Carlos Delgado Kloos (EC-TEL, 2012)

We Have No Feelings, We Have Emoticons ;-). - Sarah León Rojas; Uwe Kirschenmann; Martin Wolpers (ICALT, 2012)

Clustering by usage: higher order co-occurrences of learning objects. - Katja Niemann; Hans-Christian Schmitz; Uwe Kirschenmann; Martin Wolpers; Anna Schmidt; Tim Krones (LAK, 2012)

Semi-automatic assembly of learning resources. - Katrien Verbert; Xavier Ochoa 001; Michael Derntl; Martin Wolpers; Abelardo Pardo; Erik Duval (Comput. Educ., 2012)

Reponsive and Open Learning Environments (ROLE): Requirements, Evaluation and Reflection. - Effie Lai-Chong Law; Hans-Christian Schmitz; Martin Wolpers; Ralf Klamma; Marcel Berthold; Dietrich Albert (IxD&A, 2012)

Context-Aware Recommender Systems for Learning: A Survey and Future Challenges. - Katrien Verbert; Nikos Manouselis; Xavier Ochoa 001; Martin Wolpers; Hendrik Drachsler; Ivana Bosnic; Erik Duval (IEEE Trans. Learn. Technol., 2012)

Usage Context-Boosted Filtering for Recommender Systems in TEL. - Katja Niemann; Martin Wolpers (EC-TEL, 2013)

Exploring LogiAssist - The Mobile Learning and Assistance Platform for Truck Drivers. - Maren Scheffel; Uwe Kirschenmann; Andreas Taske; Katja Adloff; Maik Kiesel; Roland Klemke; Martin Wolpers (EC-TEL, 2013)

A new collaborative filtering approach for increasing the aggregate diversity of recommender systems. - Katja Niemann; Martin Wolpers (KDD, 2013)

Aggregating social and usage datasets for learning analytics: data-oriented challenges. - Katja Niemann; Martin Wolpers; Giannis Stoitsis; Georgios Chinis; Nikos Manouselis (LAK, 2013)

Natural Europe educational games suite: using structured museum-data for creating mobile educational games. - Sarah León Rojas; Leif Oppermann; Lisa Blum; Martin Wolpers (Advances in Computer Entertainment, 2014)

Usage-Based Clustering of Learning Resources to Improve Recommendations. - Katja Niemann; Martin Wolpers (EC-TEL, 2014)

Anforderungen und Evaluation im ROLE-Projekt: Vorgehensweise und erste Erfahrungen. - Martin Wolpers (DeLFI WOrkshops, 2015)

Educational challenges for employees in project-based industry 4.0 scenarios. - Maik Kiesel; Martin Wolpers (I-KNOW, 2015)

VISLA: visual aspects of learning analytics. - Erik Duval; Katrien Verbert; Joris Klerkx; Martin Wolpers; Abelardo Pardo; Sten Govaerts; Denis Gillet; Xavier Ochoa 001; Denis Parra (LAK, 2015)

Getting a Grasp on Tag Collections by Visualising Tag Clusters Based on Higher-order Co-occurrences. - Katja Niemann; Maren Scheffel; Sarah León Rojas; Martin Wolpers; Hendrik Drachsler; Marcus Specht (VISLA@LAK, 2015)

Creating Usage Context-Based Object Similarities to Boost Recommender Systems in Technology Enhanced Learning. - Katja Niemann; Martin Wolpers (IEEE Trans. Learn. Technol., 2015)

In Memoriam: Martin Wolpers, PhD 1969-2016. - Stefaan Ternier; Maren Scheffel; Ralf Klamma; Katherine Maillet; Wolfgang Nejdl; Martin Wolpers (IEEE Trans. Learn. Technol., 2016)

Analyzing the Impact of Using Optional Activities in Self-Regulated Learning. - José A. Ruipérez-Valiente; Pedro J. Muñoz Merino; Carlos Delgado Kloos; Katja Niemann; Maren Scheffel; Martin Wolpers (IEEE Trans. Learn. Technol., 2016)