J. Kahan, и M. Koivunen. WWW '01: Proceedings of the 10th international conference on World Wide Web, стр. 623--632. New York, NY, USA, ACM Press, (2001)
X. Wu, L. Zhang, и Y. Yu. WWW '06: Proceedings of the 15th international conference on World Wide Web, стр. 417--426. New York, NY, USA, ACM Press, (2006)
S. Handschuh, S. Staab, и R. Volz. WWW '03: Proceedings of the 12th international conference on World Wide Web, стр. 431--438. New York, NY, USA, ACM, (2003)
S. Bao, G. Xue, X. Wu, Y. Yu, B. Fei, и Z. Su. WWW '07: Proceedings of the 16th international conference on World Wide Web, New York, NY, USA, ACM Press, (2007)