D. Beeferman, and A. Berger. KDD '00: Proceedings of the sixth ACM SIGKDD international conference on Knowledge discovery and data mining, page 407--416. New York, NY, USA, ACM, (2000)
Y. Chi, S. Zhu, X. Song, J. Tatemura, and B. Tseng. KDD '07: Proceedings of the 13th ACM SIGKDD international conference on Knowledge discovery and data mining, page 163--172. New York, NY, USA, ACM, (2007)