1. Toward the next generation of recommender systems: a survey of the state-of-the-art and possible extensions;Adomavicius;IEEE Transactions on Knowledge and Data Engineering,2005
2. Modern Information Retrieval;Baeza-Yates,1999
3. P. Bose, E. Kranakis, D. Krizanc, M.V. Martin, J. Czyzowicz, A. Pelc, L. Gasieniec, Strategies for hotlink assignments, in: Proceedings of the 11th Annual International Symposium on Algorithms and Computation, LNCS, vol. 1969, 2000, pp. 23–34.
4. Introduction to Algorithms;Cormen,2001
5. Faster algorithms for finding lowest common ancestors in directed acyclic graphs;Czumaj;Theoretical Computer Science,2007