P. Wang, L. Ji, J. Yan, L. Jin, and W. Ma. Proceedings of the 25th ACM International on Conference on Information and Knowledge Management, page 277--286. New York, NY, USA, ACM, (2016)
F. Zhang, N. Yuan, D. Lian, X. Xie, and W. Ma. Proceedings of the 22Nd ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 353--362. New York, NY, USA, ACM, (2016)