B. Yu, und M. Singh. Cooperative Information Agents IV - The Future of Information Agents in Cyberspace, Volume 1860 von Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (2000)
P. Jurczyk, und E. Agichtein. Proceedings of the sixteenth ACM conference on Conference on information and knowledge management, Seite 919--922. New York, NY, USA, ACM, (2007)