J. Yan, N. Liu, G. Wang, W. Zhang, Y. Jiang, и Z. Chen. Proceedings of the 18th international conference on World wide web, стр. 261--270. New York, NY, USA, ACM, (2009)
Y. Chen, G. Xue, и Y. Yu. WSDM '08: Proceedings of the international conference on Web search and web data mining, стр. 251--260. New York, NY, USA, ACM, (2008)