T. Joachims, L. Granka, B. Pan, H. Hembrooke, und G. Gay. Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, Seite 154--161. New York, NY, USA, ACM, (2005)
K. Wang, T. Walker, und Z. Zheng. KDD '09: Proceedings of the 15th ACM SIGKDD international conference on Knowledge discovery and data mining, Seite 1355--1364. New York, NY, USA, ACM, (2009)