F. Zhong, D. Wang, G. Wang, W. Chen, Y. Zhang, Z. Chen, и H. Wang. Proceeding of the 33rd international ACM SIGIR conference on Research and development in information retrieval, стр. 355--362. New York, NY, USA, ACM, (2010)
B. Hu, Y. Zhang, W. Chen, G. Wang, и Q. Yang. Proceedings of the 20th international conference on World wide web, стр. 17--26. New York, NY, USA, ACM, (2011)