D. Hu, Q. Yang, and Y. Li. ADKDD '08: Proceedings of the 2nd International Workshop on Data Mining and Audience Intelligence for Advertising, page 27--36. New York, NY, USA, ACM, (2008)
H. Dai, L. Zhao, Z. Nie, J. Wen, L. Wang, and Y. Li. WWW '06: Proceedings of the 15th international conference on World Wide Web, page 829--837. New York, NY, USA, ACM, (2006)
X. Li, Y. Wang, and A. Acero. SIGIR '08: Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval, page 339--346. New York, NY, USA, ACM, (2008)