M. Sutaone, P. Bartakke, V. Vyas, и N. Pasalkar. TENCON 2003. Conference on Convergent Technologies for Asia-Pacific
Region, 1, стр. 235--238. IEEE Computer Society, (2003)
P. Symeonidis, A. Nanopoulos, и Y. Manolopoulos. RecSys '08: Proceedings of the 2008 ACM conference on Recommender systems, стр. 43--50. New York, NY, USA, ACM, (2008)