Alani, H.; Staab, S. & Stumme, G., ed. (2008), Proceedings of the Dagstuhl Seminar on Social Web Communities , Schloss Dagstuhl .
Krause, B.; Schmitz, C.; Hotho, A. & Stumme, G. (2008), The Anti-Social Tagger - Detecting Spam in Social Bookmarking Systems, in 'Proc. of the Fourth International Workshop on Adversarial Information Retrieval on the Web' .