P. Dmitriev, N. Eiron, M. Fontoura, и E. Shekita. Proceedings of the 15th International Conference on World Wide Web, стр. 811--817. New York, NY, USA, ACM, (2006)
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)