[1] Paul Resnick, N. Iacovou, M. Suchak, Peter Bergstrom, and John Riedl. GroupLens: an open architecture for collaborative filtering of netnews. In CSCW'94: Proceedings of the 1994 ACM conference on Computer supported cooperative work, pp.175-186. ACM, 1994.
[2] G. Linden, B. Smith, and J. York. Amazon. com recommendations: Item-to-item collaborative filtering. IEEE Internet Computing, Vol.7, No.1, pp.76-80, January 2003.
[3] Gediminas Adomavicius and Alexander Tuzhilin. Toward the next generation of recommender systems: A survey of the state-of-the-art and possible extensions. IEEE transactions on knowledge and data engineering, Vol.17, No.6, pp.734-749, 2005.