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, (2012)
P. Klügl, M. Toepfer, F. Lemmerich, A. Hotho, и F. Puppe. Proceedings of 1st International Conference on Pattern Recognition Applications and Methods ICPRAM, стр. 240-248. Vilamoura, Algarve, Portugal, SciTePress, (2012)
R. Jäschke, A. Hotho, F. Mitzlaff, и G. Stumme. Recommender Systems for the Social Web, том 32 из Intelligent Systems Reference Library, Springer, Berlin/Heidelberg, (2012)