Krause, Beate, Schmitz, Christoph, Hotho, Andreas, Stumme, Gerd: The anti-social tagger: detecting spam in social bookmarking systems. In: AIRWeb '08: Proceedings of the 4th international workshop on Adversarial information retrieval on the web. New York, NY, USA : ACM, 2008. - ISBN 978-1-60558-159-0, S. 61--68