Y. Duan, L. Jiang, T. Qin, M. Zhou, and H. Shum. Proceedings of the 23rd International Conference on Computational Linguistics, page 295--303. Stroudsburg, PA, USA, Association for Computational Linguistics, (2010)
T. Liu, J. Xu, T. Qin, W. Xiong, and H. Li. SIGIR '07: Proceedings of the Learning to Rank workshop in the 30th annual international ACM SIGIR conference on Research and development in information retrieval, (2007)
O. Chapelle, D. Metlzer, Y. Zhang, and P. Grinspan. Proceedings of the 18th ACM conference on Information and knowledge management, page 621--630. New York, NY, USA, ACM, (2009)