R. Wetzker, C. Zimmermann, C. Bauckhage, und S. Albayrak. WSDM '10: Proceedings of the Third ACM International Conference on Web Search and Data Mining, Seite 71--80. New York, NY, USA, ACM, (2010)
M. Riedl, und R. Amant. AAMAS '03: Proceedings of the second international joint conference on Autonomous agents and multiagent systems, Seite 361--368. New York, NY, USA, ACM Press, (2003)