H. Zeng, Q. He, Z. Chen, W. Ma, and J. Ma. Proceedings of the 27th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, page 210--217. New York, NY, USA, ACM, (2004)
Y. Liu, B. Gao, T. Liu, Y. Zhang, Z. Ma, S. He, and H. Li. SIGIR '08: Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 451--458. New York, NY, USA, ACM, (2008)
C. Ding, X. He, and H. Zha. KDD '01: Proceedings of the seventh ACM SIGKDD international conference on Knowledge discovery and data mining, page 275--280. New York, NY, USA, ACM, (2001)
D. Cai, Z. Shao, X. He, X. Yan, and J. Han. LinkKDD '05: Proceedings of the 3rd international workshop on Link discovery, page 58--65. New York, NY, USA, ACM, (2005)