H. Ma, D. Zhou, C. Liu, M. Lyu, and I. King. Proceedings of the Fourth ACM International Conference on Web Search and Data Mining, page 287--296. New York, NY, USA, ACM, (2011)
H. Ma, D. Zhou, C. Liu, M. Lyu, and I. King. Proceedings of the Fourth ACM International Conference on Web Search and Data Mining, page 287--296. New York, NY, USA, ACM, (2011)