Y. Koren. Proceedings of the 14th ACM SIGKDD International Conference on Knowledge Discovery and Data Mining, page 426--434. New York, NY, USA, ACM, (2008)
S. Rendle, and L. Schmidt-Thieme. Proceedings of the third ACM international conference on Web search and data mining, page 81--90. New York, NY, USA, ACM, (2010)