1. Adomavicius, G., Tuzhilin, A.: Toward the Next Generation of Recommender Systems: A Survey of the State-of-the-Art and Possible Extensions. IEEE Trans. on Knowl. and Data Eng. 17(6), 734–749 (2005)
2. Anderson, L., Krathwohl, D., Airasian, P., Cruikshank, K., Mayer, R., Pintrich, P., Raths, J., Wittrock, M. (eds.): A taxonomy for learning, teaching, and assessing: A revision of Bloom’s taxonomy of educational objectives. Addison Wesley Longman Inc. (2001)
3. Lecture Notes in Computer Science;R Baeza-Yates,2007
4. Lecture Notes in Computer Science;R Baeza-Yates,2004
5. Lecture Notes in Computer Science;L Bai,2011