A. Gabrielli, A. Baldassarri, and B. Sapoval. Physical Review E (Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics), 62 (3):
3103-3115(2000)
S. Braun, and A. Schmidt. Mensch und Computer 2006: Mensch und Computer im Strukturwandel, page 283-292. Munich, Germany, Oldenbourg Verlag, (3-6 September 2006)
A. Schmidt, and S. Braun. First European Conference on Technology Enhanced Learning - EC-TEL 2006, page 518-524. Berlin Heidelberg, Germany, Springer-Verlag, (1-4 October 2006)
S. Braun, and A. Schmidt. Proceedings of I-KNOW 2006, Special Track on Integrating Working and Learning, page 429-436. Berlin Heidelberg, Germany, Springer-Verlag, (6-8 September 2006)