1. P. Resnick, H.R. Varian, Recommender systems. Commun. ACM 40(3), 56–58 (1997)
2. H. Kautz, B. Selman, Creating models of real-world communities with referralweb, in Working Notes of the Workshop on Recommender Systems, Held in Conjunction with AAAI-98, Madison, WI, vol. 82, pp. 58–59 (1998)
3. G. Jawaheer, M. Szomszor, P. Kostkova, Comparison of implicit and explicit feedback from an online music recommendation service, in Proceedings of the 1st International Workshop on Information Heterogeneity and Fusion in Recommender Systems (HetRec ‘10) (ACM, USA, 2010), pp. 47–51
4. D. Parra, A. Karatzoglou, X. Amatriain, I. Yavuz, Implicit feedback recommendation via implicit-to-explicit ordinal logistic regression mapping, in Proceedings of the CARS-2011, USA, October 2011, p. 5
5. X. Amatriain, J. Pujol, N. Oliver, I Like It… I Like It Not: Evaluating User Ratings Noise in Recommender Systems, User Modeling, Adaptation, and Personalization (Springer, Berlin, 2009), pp. 247–258