P. Melville, R. Mooney, and R. Nagarajan. Eighteenth national conference on Artificial intelligence, page 187--192. Menlo Park, CA, USA, American Association for Artificial Intelligence, (2002)
I. Konstas, V. Stathopoulos, and J. Jose. Proceedings of the 32nd international ACM SIGIR conference on Research and development in information retrieval, page 195--202. New York, NY, USA, ACM, (2009)
Schafer, D. Frankowski, J. Herlocker, and S. Sen. The Adaptive Web, volume 4321 of Lecture Notes in Computer Science, chapter 9, Springer Berlin Heidelberg, Berlin, Heidelberg, (2007)