1. Borghoff, U.M. and Schlichter J.H. (1995). Rechnergestützte Gruppenarbeit. Springer-Verlag, Berlin.
2. Bürger, M. (1998). Unterstützung von Awareness bei der Gruppenarbeit mit gemeinsamen Arbeitsbereichen. PhD thesis, Technische Universität München.
3. Burton, M. and Brna, P. (1996). Clarissa: An exploration of collaboration through agent-based dialogue games. In: Bma, P., Paiva, A. and Self, J. (eds.). Proceedings of the European Conference on Artificial Intelligence in Education EuroAIED’96,Lisbon.
4. Chan T.-W. and Baskin, A.B. (1988). Studying with the prince: The computer as a learning companion. In: Proceedings of the International Conference on Intelligent Tutoring Systems, Montreal, 194–200.
5. FIPA (1998) Agent communication language. FIPA 97 Specification, Version 2.0 Part 2, Foundation for Intelligent Physical Agents, Geneva, Switzerland, 1998.