A. Hotho, R. Jäschke, C. Schmitz, und G. Stumme. Proceedings of the 3rd European Semantic Web Conference, Volume 4011 von LNCS, Seite 411-426. Budva, Montenegro, Springer, (Juni 2006)
G. Salton, und C. Buckley. SIGIR '88: Proceedings of the 11th annual international ACM SIGIR conference on Research and development in information retrieval, Seite 147--160. New York, NY, USA, ACM Press, (1988)
B. Fonseca, P. Golgher, B. Pôssas, B. Ribeiro-Neto, und N. Ziviani. CIKM '05: Proceedings of the 14th ACM international conference on Information and knowledge management, Seite 696--703. New York, NY, USA, ACM Press, (2005)
K. Lang. Proceedings of the 12th International Conference on Machine Learning, Seite 331--339. Morgan Kaufmann publishers Inc.: San Mateo, CA, USA, (1995)