1. P. Resnick and H. Varian. Recommender systems. Communications of the ACM, 40(3):56–58, 1997.
2. J. Breese, D. Heckerman, and C. Kadie. Empirical analysis of predictive algorithms for collaborative filtering. In Proceedings of the Fourteenth Conference on Uncertainty in Artifi cial Intelligence, Madison, WI, July 1998. Morgan Kaufmann.
3. A. Toffler. Future shock, 1970. Random House, New York.
4. J.B. Schafer, J. Konstan and J. Riedl. Recommender Systems in E-Commerce. Proceeding of the ACM Conference on Electronic Commerce, Pittsburgh, PA, USA, 1999
5. M. P. O’Mahony, N. J. Hurley, and G. C. M. Silvestre. Recommender systems: Attack types and strategies. In Proceedings of the 20th National Conference on Artificial Intelligence (AAAI-05), Pittsburgh, Pennsylvania, USA, 9–13, Jul 2005. AAAI Press.