Group-Oriented Modelling Tools with Heterogeneous Semantics. - Niels Pinkwart; Heinz Ulrich Hoppe; Lars Bollen; Eva Fuhlrott (Intelligent Tutoring Systems, 2002)

The Use of Mobile Computing to Support SMS Dialogues and Classroom Discussions in a Literature Course. - Lars Bollen; Sabrina C. Eimler; Heinz Ulrich Hoppe (ICALT, 2004)

An Integrated Approach for Analysis-Based Report Generation. - Lars Bollen; Andreas Harrer; Heinz Ulrich Hoppe (ICALT, 2004)

Toward Cognitive Tutoring in a Collaborative, Web-Based Environment. - Bruce M. McLaren; Kenneth R. Koedinger; Mike Schneider; Andreas Harrer; Lars Bollen (ICWE Workshops, 2004)

SMS-based Discussions - Technology Enhanced Collaboration for a Literature Course. - Lars Bollen; Sabrina C. Eimler; Heinz Ulrich Hoppe (WMTE, 2004)

Generating Reports of Graphical Modelling Processes for Authoring and Presentation. - Lars Bollen (AIED, 2005)

Collaboration and Cognitive Tutoring: Integration, Empirical Results, and Future Directions. - Andreas Harrer; Bruce M. McLaren; Erin Walker; Lars Bollen; Jonathan Sewall (AIED, 2005)

Cognitive tutoring of collaboration: developmental and empirical steps towards realization. - Bruce M. McLaren; Lars Bollen; Erin Walker; Andreas Harrer; Jonathan Sewall (CSCL, 2005)

Is There a Way to e-Bologna? Cross-National Collaborative Activities in University Courses. - Andreas Harrer; Georgios Kahrimanis; Sam Zeini; Lars Bollen; Nikolaos M. Avouris (EC-TEL, 2006)

PDAs as Input Devices in Brainstorming and Creative Discussions. - Lars Bollen; Guillermo Juarez; Micha Westermann; Heinz Ulrich Hoppe (WMTE, 2006)

Creating cognitive tutors for collaborative learning: steps toward realization. - Andreas Harrer; Bruce M. McLaren; Erin Walker; Lars Bollen; Jonathan Sewall (User Model. User Adapt. Interact., 2006)

A Broker Architecture for Integration of Heterogeneous Applications for Inquiry Learning. - Lars Bollen; Andreas Harrer; Heinz Ulrich Hoppe; Wouter R. van Joolingen (ICALT, 2007)

CIEL, architectures for collaborative inquiry and experiential learning. - Wouter R. van Joolingen; Lars Bollen; Heinz Ulrich Hoppe; Ton de Jong (ICALT, 2007)

Flexible Analysis of User Actions in Heterogeneous Distributed Learning Environments. - Lars Bollen; Adam Giemza; Heinz Ulrich Hoppe (EC-TEL, 2008)

Learning Activity Spaces: Towards Flexibility in Learning Design? - Anne Lejeune; Muriel Ney; Armin Weinberger; Margus Pedaste; Lars Bollen; Tasos Hovardas; Ulrich Hoppe; Ton de Jong (ICALT, 2009)

A Graphical Modeling Language for Computer-Based Learning Scenarios. - Anne Lejeune; Muriel Ney; Armin Weinberger; Margus Pedaste; Lars Bollen; Tasos Hovardas; Ulrich Hoppe; Ton de Jong (ICALT, 2009)

Learning to Program with COALA, a Distributed Computer Assisted Environment. - Francisco Jurado 001; Ana I. Molina; Miguel A. Redondo; Manuel Ortega 001; Adam Giemza; Lars Bollen; Heinz Ulrich Hoppe (J. Univers. Comput. Sci., 2009)

Interactive drawing tools to support modeling of dynamic systems. - Wouter R. van Joolingen; Lars Bollen (ICLS, 2010)

LEMONADE: A Flexible Authoring Tool for Integrated Mobile Learning Scenarios. - Adam Giemza; Lars Bollen; Peter Seydel; André Overhagen; Heinz Ulrich Hoppe (WMUTE, 2010)

Learning by creating and exchanging objects: The SCY experience. - Ton de Jong; Wouter R. van Joolingen; Adam Giemza; Isabelle Girault; Ulrich Hoppe; Jörg Kindermann; Anders Kluge; Ard W. Lazonder; Vibeke Vold; Armin Weinberger; Stefan Weinbrenner; Astrid Wichmann; et al. (Br. J. Educ. Technol., 2010)

Activity structuring and activity monitoring in heterogeneous learning scenarios with mobile devices. - Lars Bollen (2010)

Using Drawings in Knowledge Modeling and Simulation for Science Teaching. - Wouter R. van Joolingen; Lars Bollen; Frank A. J. Leenaars (Advances in Intelligent Tutoring Systems, 2010)

LEMONADE: field-trip authoring and classroom reporting for integrated mobile learning scenarios with intelligent agent support. - Adam Giemza; Lars Bollen; Heinz Ulrich Hoppe (Int. J. Mob. Learn. Organisation, 2011)

Enabling and Evaluating Mobile Learning Scenarios with Multiple Input Channels. - Lars Bollen; Sabrina C. Eimler; Marc Jansen; Jan Engler (CRIWG, 2012)

Computer-Supported Collaborative Drawing in Primary School Education - Technical Realization and Empirical Findings. - Lars Bollen; Hannie Gijlers; Wouter R. van Joolingen (CRIWG, 2012)

Drawing-Based Simulation for Primary School Science Education: An Experimental Study of the GearSketch Learning Environment. - Frank Leenaars; Wouter R. van Joolingen; Hannie Gijlers; Lars Bollen (DIGITEL, 2012)

Drawing-Based Modeling for Early Science Education. - Wouter R. van Joolingen; Lars Bollen; Frank Leenaars; Hannie Gijlers (ITS, 2012)

Cloud Services for Learning Scenarios: Widening the Perspective. - Marc Jansen; Lars Bollen; Nelson Baloian; Ulrich Hoppe (WCLOUD, 2012)

Towards a Multichannel Input Dimension in Learning Scenarios with Mobile Devices. - Lars Bollen; Marc Jansen; Sabrina C. Eimler (WMUTE, 2012)

An Architecture for Supporting Heterogeneous Multi-Device Learning Environments. - Adam Giemza; Lars Bollen; Marc Jansen; Heinz Ulrich Hoppe (WMUTE, 2012)

Automating the Analysis of Problem-solving Activities in Learning Environments: the Co-Lab Case Study. - Rafael Duque; Lars Bollen; Anjo Anjewierden; Crescencio Bravo (J. Univers. Comput. Sci., 2012)

Towards an Online Lab Portal for Inquiry-Based STEM Learning at School. - Sten Govaerts; Yiwei Cao; Andrii Vozniuk; Adrian Holzer; Danilo Garbi Zutin; Elio San Cristóbal Ruiz; Lars Bollen; Sven Manske; Nils Faltin; Christophe Salzmann; Eleftheria Tsourlidaki; Denis Gillet (ICWL, 2013)

Using self-made drawings to support modelling in science education. - Frank A. J. Leenaars; Wouter R. van Joolingen; Lars Bollen (Br. J. Educ. Technol., 2013)

Collaborative drawing on a shared digital canvas in elementary science education: The effects of script and task awareness support. - Hannie Gijlers; Armin Weinberger; Alieke Mattia van Dijk; Lars Bollen; Wouter R. van Joolingen (Int. J. Comput. Support. Collab. Learn., 2013)

A flexible unified architecture to support heterogeneous multi-device learning environments. - Adam Giemza; Lars Bollen; Marc Jansen; Heinz Ulrich Hoppe (Int. J. Mob. Learn. Organisation, 2013)

Using Cloud Services to Develop Learning Scenarios from a Software Engineering Perspective. - Marc Jansen; Lars Bollen; Nelson Baloian; Heinz Ulrich Hoppe (J. Univers. Comput. Sci., 2013)

SimSketch: Multiagent Simulations Based on Learner-Created Sketches for Early Science Education. - Lars Bollen; Wouter R. van Joolingen (IEEE Trans. Learn. Technol., 2013)

A Flexible Framework for the Authoring of Reusable and Portable Learning Analytics Gadgets. - Sven Manske; Tobias Hecking; Lars Bollen; Tilman Göhnert; Alfredo Ramos Lezama; Heinz Ulrich Hoppe (ICALT, 2014)

A Flexible and Extendable Learning Analytics Infrastructure. - Tobias Hecking; Sven Manske; Lars Bollen; Sten Govaerts; Andrii Vozniuk; Heinz Ulrich Hoppe (ICWL, 2014)

AngeLA: Putting the teacher in control of student privacy in the online classroom. - Andrii Vozniuk; Sten Govaerts; Lars Bollen; Sven Manske; Tobias Hecking; Denis Gillet (ITHET, 2014)

The AppComposer Web application for school teachers: A platform for translating and adapting educational web applications. - Luis Rodriguez-Gil; Pablo Orduña; Lars Bollen; Sten Govaerts; Adrian Holzer; Denis Gillet; Diego López-de-Ipiña; Javier García-Zubía (EDUCON, 2015)

Drawings in Computer-Supported Collaborative Learning - Empirical and Technical Results. - Lars Bollen; Hannie Gijlers; Wouter R. van Joolingen (Comput. Informatics, 2015)

Cloud ecosystem for supporting inquiry learning with online labs: Creation, personalization, and exploitation. - Denis Gillet; María Jesús Rodríguez-Triana; Ton de Jong; Lars Bollen; Diana Dikke (exp.at, 2017)

Computational Thinking in Primary School: An Examination of Abstraction and Decom-position in Different Age Groups. - Wouter J. Rijke; Lars Bollen; Tessa H. S. Eysink; Jos Tolboom (Informatics Educ., 2018)

Improving the quality of vocational students' collaboration and knowledge acquisition through instruction and joint reflection. - Elise H. Eshuis; Judith ter Vrugte; Anjo Anjewierden; Lars Bollen; Jakob Sikken; Ton de Jong (Int. J. Comput. Support. Collab. Learn., 2019)