R. Kanawati, and M. Malek. AAMAS '02: Proceedings of the first international joint conference on Autonomous agents and multiagent systems, page 1137--1138. New York, NY, USA, ACM Press, (2002)
D. Benz, K. Tso, and L. Schmidt-Thieme. Proceedings of the Second Workshop on Innovations in Web Infrastructure (IWI 2006), Edinburgh, Scotland, (2006)
P. Heymann, G. Koutrika, and H. Garcia-Molina. WSDM '08: Proceedings of the international conference on Web search and web data mining, page 195--206. New York, NY, USA, ACM, (2008)