H. Yang, S. Parthasarathy, and S. Mehta. KDD '05: Proceeding of the eleventh ACM SIGKDD international conference on Knowledge discovery in data mining, page 716--721. New York, NY, USA, ACM Press, (2005)
H. Yang, S. Mehta, and S. Parthasarathy. Proceedings of the 19th Internationl Joint Conference of Artificial Intelligence (IJCAI), page 902--907. (2005)