7Ben J Schafer, Dan Frankowski, Jon Herlocker and Shilad Sen. Collaborative filtering recommender systems[J]. Lecture Notes in Computer Science, 2007(4321):291-324.
8Aymand J Mooney, Loriene Roy. Content- based book recommending usinglearning for text categorization[C]//Proceedings of the fifth ACM Conference on Digital libraries, 2000:95-204.
