Q. Li, Y. Zheng, X. Xie, Y. Chen, W. Liu, and W. Ma. Proceedings of the 16th ACM SIGSPATIAL international conference on Advances in geographic information systems, page 34. ACM, (2008)
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, (2006)
B. Zhang, H. Li, Y. Liu, L. Ji, W. Xi, W. Fan, Z. Chen, and W. Ma. SIGIR '05: Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 504--511. New York, NY, USA, ACM, (2005)
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)