B. Krause, R. Jäschke, A. Hotho, и G. Stumme. HT '08: Proceedings of the Nineteenth ACM Conference on Hypertext and Hypermedia, стр. 157-166. New York, NY, USA, ACM, (2008)
R. Lambiotte, и M. Ausloos. International Conference on Computational Science, том 3993 из Lecture Notes in Computer Science, стр. 1114--1117. Springer, (2006)