S. Lee, und D. Kim. Proceedings of the Ninth International Conference on Machine Learning and Applications (ICMLA), Seite 767 --770. Washington, DC, (Dezember 2010)
S. Moghaddam, und M. Ester. Proceedings of the 19th ACM international conference on Information and knowledge management, Seite 1825--1828. New York, NY, USA, ACM, (2010)