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- ACM Comput. Surv. (July 2009)
- Otto-von-Guericke-Universitat Magdeburg, (2009)
- Web Engineering, volume 6757 of Lecture Notes in Computer Science, Springer Berlin / Heidelberg, 10.1007/978-3-642-22233-7_19 . (2011)
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- RecSys '08: Proceedings of the 2008 ACM conference on Recommender systems, page 259--266. New York, NY, USA, ACM, (2008)
- ICML '09: Proceedings of the 26th Annual International Conference on Machine Learning, page 1073--1080. New York, NY, USA, ACM, (2009)
- IEEE Transactions on Pattern Analysis and Machine Intelligence 23(2):196-206 (2001)
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