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Z. Li, B. Wang, M. Li, and W. Ma. SIGIR '05: Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 106--113. New York, NY, USA, ACM Press, (2005)
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W. Xi, B. Zhang, Z. Chen, Y. Lu, S. Yan, W. Ma, and E. Fox. WWW '04: Proceedings of the 13th international conference on World Wide Web, page 319--327. New York, NY, USA, ACM Press, (2004)
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Q. Zhao, S. Hoi, T. Liu, S. Bhowmick, M. Lyu, and W. Ma. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 543--552. New York, NY, USA, ACM Press, (2006)
Z. Nie, Y. Ma, S. Shi, J. Wen, and W. Ma. WWW '07: Proceedings of the 16th international conference on World Wide Web, page 81--90. New York, NY, USA, ACM, (2007)
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