M. Collins, and N. Duffy. Advances in Neural Information Processing Systems 14 --- Proceedings of the 2001 Neural Information Processing Systems Conference (NIPS 2001), December 3-8, 2001, Vancouver, British Columbia, Canada, page 625--632. MIT Press, Cambridge, MA, USA, (2002)
F. Jiang, and M. Littman. Proceedings of the 7th International Conference on Machine Learning. Stanford University June 29-July 2, 2000, page 423-430. (2000)
Q. Zhao, S. Hoi, T. Liu, S. Bhowmick, M. Lyu, and W. Ma. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 543--552. New York, NY, USA, ACM Press, (2006)
S. Muggleton, H. Lodhi, A. Amini, and M. Sternberg. Discovery Science, 8th International Conference, DS 2005,, volume 3735 of Lecture Notes in Computer Science, page 163-175. Springer, (2005)