1. K. P. Birman. Building Secure and Reliable Network Applications. Prentice Hall, 1997. Out of print, but an online version is available at: http://www.cs.cornell.edu/ken/ .
2. S. Chodrow, S. Cheung, P. Hutto, A. Krantz, P. Gray, T. Goddard, I. Rhee, and V. Sunderam. CCF: A Collaborative Computing Frameworks. In IEEE Internet Computing, January / February 2000.
3. Lynne Coventry. Videoconferencing in higher education. Technical report, Institute for Computer Based Learning, Herriot Watt University, 1997. Available from: http://www.man.ac.uk/MVC/SIMA/video3/contents.html .
4. Lect Notes Comput Sci;M. Curley,2002
5. Genius-generic e-learning environments and paradigms for the new pan european information and communication technologies curricula. EC project, 2001-2003.