E. Ferrante, A. Lazaric, and M. Restelli. Proceedings of the 7th international joint conference on Autonomous agents and multiagent systems - Volume 3, International Foundation for Autonomous Agents and Multiagent Systems, Richland, SC, (2008)
C. Dwork, R. Kumar, M. Naor, and D. Sivakumar. Proceedings of the 10th international conference on World Wide Web, page 613--622. New York, NY, USA, (2001)
M. Sutaone, P. Bartakke, V. Vyas, and N. Pasalkar. TENCON 2003. Conference on Convergent Technologies for Asia-Pacific
Region, 1, page 235--238. IEEE Computer Society, (2003)