K. Chen, R. Lu, C. Wong, G. Sun, L. Heck, and B. Tseng. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge management, page 1143--1152. New York, NY, USA, ACM, (2008)
T. Joachims. Proceedings of the 12th ACM SIGKDD international conference on Knowledge discovery and data mining, page 217--226. New York, NY, USA, ACM, (2006)
D. Shahaf, C. Guestrin, and E. Horvitz. Proceedings of the 21st International Conference on World Wide Web, page 899--908. New York, NY, USA, ACM, (2012)