1. Avouris, N., Dimitracopoulou, A., Komis, V., and Fidas, C. (2002). OCAF: An object-oriented model of analysis of collaborative problem solving. In Proceedings of CSCL 2002, Boulder, CO (p. 92-101).
2. Barros, B., Verdejo, M., Read, T., and Mizoguchi, R. (2002). Applications of a collaborative learning ontology. In Second Mexican International Conference on Artificial Intelligence, MICAI 2002, Mérida (Vol. 2313, p. 301–310).
3. Bray, T., Paoli, J., Sperberg-McQueen, C. M., and Maler, E. (2000). Extensible markup language (XML) 1.0 (second ed.) W3C Recommendation. Available on line at:
http://www.w3.org
/TR/REC-xml.
4. Dillenbourg, P. (1999). Introduction; What do you mean by “Collaborative Learning”? In P. Dillenbourg (Ed.), Collaborative learning. Cognitive and computational approaches (p. 1–19). Oxford: Elsevier Science.
5. Jermann, P., Soller, A., and Mühlenbrock, M. (2001). From mirroring to guiding: a review of the state of the art technology for supporting collaborative learning. In Proceedings of EuroCSCL, Maastricht (p. 324-331).