S. Chen, J. Xu, and T. Joachims. Proceedings of the 19th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 865--873. New York, NY, USA, ACM, (2013)
Y. Chuan, X. Jieping, and D. Xiaoyong. ICEC '06: Proceedings of the 8th international conference on Electronic commerce, page 574--578. New York, NY, USA, ACM Press, (2006)