J. Fogarty, R. Baker, und S. Hudson. GI '05: Proceedings of Graphics Interface 2005, Seite 129--136. School of Computer Science, University of Waterloo, Waterloo, Ontario, Canada, Canadian Human-Computer Communications Society, (2005)
J. Davis, und M. Goadrich. ICML '06: Proceedings of the 23rd international conference on Machine learning, Seite 233--240. New York, NY, USA, ACM, (2006)