C. Lu, X. Chen, und E. Park. CIKM '09: Proceeding of the 18th ACM conference on Information and knowledge management, Seite 1545--1548. New York, NY, USA, ACM, (2009)
A. Popescul, L. Ungar, D. Pennock, und S. Lawrence. 17th Conference on Uncertainty in Artificial Intelligence, Seite 437--444. Seattle, Washington, (August 2001)
A. Wu, M. Garland, und J. Han. KDD '04: Proceedings of the tenth ACM SIGKDD international conference on Knowledge discovery and data mining, Seite 719--724. New York, NY, USA, ACM Press, (2004)