B. Krause, C. Schmitz, A. Hotho, und G. Stumme. Proceedings of the 4th International Workshop on Adversarial Information Retrieval on the Web, Seite 61--68. New York, NY, USA, ACM, (2008)
F. Mitzlaff, M. Atzmueller, D. Benz, A. Hotho, und G. Stumme. Analysis of Social Media and Ubiquitous Data, Volume 6904 von Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2011)