S. Doerfel, R. Jäschke, A. Hotho, и G. Stumme. Proceedings of the 4th ACM RecSys workshop on Recommender systems and the social web, стр. 9--16. New York, NY, USA, ACM, (сентября 2012)
R. Jäschke, L. Marinho, A. Hotho, L. Schmidt-Thieme, и G. Stumme. Knowledge Discovery in Databases: PKDD 2007, 11th European Conference on Principles and Practice of Knowledge Discovery in Databases, том 4702 из Lecture Notes in Computer Science, стр. 506-514. Berlin, Heidelberg, Springer, (2007)