F. Abel, N. Henze, und D. Krause. CIKM '08: Proceeding of the 17th ACM conference on Information and knowledge mining, Seite 1429--1430. New York, NY, USA, ACM, (2008)
S. Rendle, L. Marinho, A. Nanopoulos, und L. Schmidt-Thieme. KDD '09: Proceedings of the 15th ACM SIGKDD international conference on Knowledge discovery and data mining, Seite 727--736. New York, NY, USA, ACM, (2009)