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L. Bollen, H. Hoppe, M. Milrad, and N. Pinkwart. Proceedings of the XX International Conference of the System Dynamics Society, page 53. Palermo, Italy, , (2002)
L. Bollen, G. Juarez, M. Westermann, and H. Hoppe. Proceedings of 4th International Workshop on Wireless, Mobile and Ubiquitous Technologies in Education (WMUTE), page 137-141. Los Alamitos, CA, IEEE, (2006)
L. Bollen, A. Harrer, H. Hoppe, and W. van Joolingen. The 7th IEEE International Conference on Advanced Learning Technologies ICALT 2007, page 15-17. Los Alamitos, CA., IEEE Computer Society, (2007)
B. McLaren, K. Koedinger, M. Schneider, A. Harrer, and L. Bollen. Proceedings of the Workshop on Analyzing Student-Tutor Interaction Logs to Improve Educational Outcomes, Seventh International Conference on Intelligent Tutoring Systems (ITS-2004), , (2004)
A. Harrer, B. McLaren, E. Walker, L. Bollen, and J. Sewell. Artificial Intelligence in Education - Supporting Learning through Intelligent and Socially Informed Technology, page 266-273. Amsterdam (The Netherlands), IOS Press, (2005)
L. Bollen, S. Eimler, and H. Hoppe. Proceedings of the 2nd IEEE International Workshop on Wireless and Mobile Technologies in Education, WMTE 2004, page 209-210. Los Alamitos, California (USA), , (2004)
L. Bollen, A. Harrer, and H. Hoppe. Proceedings of the 4th IEEE International Conference on Advanced Learning Technologies, ICALT 2004, page 1094-1095. , (2004)
L. Bollen, N. Pinkwart, M. Kuhn, and H. Hoppe. Digitaler Campus. Vom Medienprojekt zum nachhaltigen Medieneinsatz in der Hochschule. (Reihe Medien in der Wissenschaft), Münster, Waxmann Verlag, (2003)
A. Harrer, L. Bollen, and U. Hoppe. Proc. of Workshop on Artificial Intelligence in Computer Supported Collaborative Learning at European Conference on Articificial Intelligence ECAI 2004, Valencia, , (2004)
L. Bollen, S. Eimler, and U. Hoppe. Proceedings of the 4th IEEE International Conference on Advanced Learning Technologies, ICALT 2004, page 550-554. Los Alamitos, CA, IEEE, (2004)