\bibitem{ppdn}
Vlado Keselj and Nick Cercone.
\newblock PPDN--A Framework for Peer-to-peer Collaborative Research
Network.
\newblock In {\em Proceedings of The Second International Workshop on
Web-based Support Systems (WSS'04)\/.}
Beijing, China, September 2004.
In conjunction with 2004 IEEE/WIC/ACM International Conference on Web
Intelligence. pp.~88--93.