T. Liu, and W. Ma. WI '05: Proceedings of the The 2005 IEEE/WIC/ACM International Conference on Web Intelligence (WI'05), page 515--521. Washington, DC, USA, IEEE Computer Society, (2005)
W. Xi, E. Fox, W. Fan, B. Zhang, Z. Chen, J. Yan, and D. Zhuang. SIGIR '05: Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 130--137. New York, NY, USA, ACM, (2005)