M. French, {. Szepesvári, and E. Rogers. Proceedings of the International Symposium on the Mathematical Theory of Networks and Systems (MTNS 2000), (2000)
S. Izmalkov, S. Micali, and M. Lepinski. Proceedings of the 46th Annual IEEE Symposium on Foundations of Computer
Science, 2005., page 585-594. New York, NJ, USA, IEEE Computer Society, (October 2005)
S. Bhattacharyya. KDD '00: Proceedings of the sixth ACM SIGKDD
international conference on Knowledge discovery and
data mining, page 465--473. Boston, Massachusetts, United States, ACM Press, (2000)