M. Bayir, I. Toroslu, A. Cosar, и G. Fidan. WWW '09: Proceedings of the 18th international conference on World wide web, стр. 161--170. New York, NY, USA, ACM, (2009)
H. Kwak, C. Lee, H. Park, и S. Moon. WWW '10: Proceedings of the 19th international conference on World wide web, стр. 591--600. New York, NY, USA, ACM, (2010)