Atzmueller, M.; Lemmerich, F.; Krause, B. & Hotho, A. (2009), Towards Understanding Spammers - Discovering Local Patterns for Concept Characterization and Description, in Johannes Fürnkranz Arno Knobbe, ed., 'Proc. LeGo-09: From Local Patterns to Global Models, Workshop at the 2009 European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases' .