J. Yuan, Y. Zheng, and X. Xie. Proceedings of the 18th ACM SIGKDD international conference on Knowledge discovery and data mining, page 186--194. ACM, (2012)
S. Feng, X. Li, Y. Zeng, G. Cong, Y. Chee, and Q. Yuan. Proceedings of the 24th International Conference on Artificial Intelligence, page 2069--2075. AAAI Press, (2015)