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Herlocker, J. L., Konstan, J. A., Terveen, L. G. & Riedl, J. T. (2004). Evaluating collaborative filtering recommender systems. ACM Trans. Inf. Syst., 22, 5--53.  doi: 10.1145/963770.963772

Herlocker, J. L., Konstan, J. A., Terveen, L. G. & Riedl, J. T. (2004). Evaluating collaborative filtering recommender systems. ACM Trans. Inf. Syst., 22, 5--53.  doi: http://doi.acm.org/10.1145/963770.963772