S. Doerfel, R. Jäschke, A. Hotho, and G. Stumme. Proceedings of the 4th ACM RecSys workshop on Recommender systems and the social web, page 9--16. New York, NY, USA, ACM, (2012)
S. Doerfel, R. Jäschke, and G. Stumme. Formal Concept Analysis - 10th International Conference, ICFCA 2012, Leuven, Belgium, May 7-10, 2012. Proceedings, volume 7278 of Lecture Notes in Computer Science, page 77-95. Berlin/Heidelberg, Springer, (2012)