M. Montagnuolo, M. Ferri, und A. Messina. HT '09: Proceedings of the 20th ACM conference on Hypertext and hypermedia, Seite 83--88. New York, NY, USA, ACM, (2009)
R. Yates, und A. Tiberi. KDD '07: Proceedings of the 13th ACM SIGKDD international conference on Knowledge discovery and data mining, Seite 76--85. New York, NY, USA, ACM, (2007)