R. Jäschke, A. Hotho, F. Mitzlaff, and G. Stumme. Recommender Systems for the Social Web, volume 32 of Intelligent Systems Reference Library, Springer, Berlin/Heidelberg, (2012)
B. Bullock, H. Lerch, A. Roßnagel, A. Hotho, and G. Stumme. Proceedings of the 11th International Conference on Knowledge Management and Knowledge Technologies, page 15:1--15:8. New York, NY, USA, ACM, (2011)
A. Kartal, S. Doerfel, A. Roßnagel, and G. Stumme. Informatik 2011 - Informatik schafft Communities - Proceedings der 41. GI-Jahrestagung, volume 192 of Lecture Notes in Informatics, page 412. Gesellschaft für Informatik e.V. (GI), Bonner Köllen Verlag, (October 2011)
J. Illig, A. Hotho, R. Jäschke, and G. Stumme. Knowledge Processing and Data Analysis, volume 6581 of Lecture Notes in Computer Science, page 136--149. Berlin/Heidelberg, Springer, (2011)