1. B. Gibson, Enabling an accessible web 2.0, in: W4A ’07: Proceedings of the 2007 International Cross-Disciplinary Conference on Web Accessibility (W4A), ACM, New York, NY, USA, 2007, pp. 1–6, ISBN 1-59593-590-X.
2. Peer-to-Peer Systems and Applications,2005
3. A survey and comparison of peer-to-peer overlay network schemes;Lua;IEEE Communications Survey and Tutorial,2005
4. J. Laister, S. Kober, Social aspects of collaborative learning in virtual learning environments, in: Proceedings of the Networked Learning 2002 Conference, Sheffield, England, 2002.
5. V. Carchiolo, D. Correnti, A. Longheu, M. Malgeri, G. Mangioni, Reliable personalized learning paths: the contribution of trust to e-learning, in: Proceedings of WSKS2008, 2008.