1. Adomavicius, G., Alexander, T.: Toward the Next Generation of Recommender Systems: A Survey of the State-of-the-Art and Possible Extensions. IEEE Trans. on Knowledge and Data Engineering 17(6), 734–749 (2005)
2. Anick, P.: Using terminological feedback for web search refinement: a log-based study. In: SIGIR 2003: Proceedings of the 26th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, pp. 88–95. ACM Press, New York (2003)
3. Balabanovic, M., Yoav, S.: Fab: content-based, collaborative recommendation. Communications of the ACM 40(3), 66–72 (1997)
4. Breese, J.S., Heckerman, D., Kadie, C.: Empirical Analysis of Predictive Algorithms for Collaborative Filtering. In: Proceedings of the 14th Conference of Uncertainty in Artificial Intelligence, pp. 43–52. Morgan Kaufmann, San Francisco (1998)
5. Burke, R.: Hybrid Recommender Systems: Survey and Experiments. User Modeling and User-Adapted Interaction 12(4), 331–370 (2002)