M. Anderka, B. Stein, und N. Lipka. Proceedings of the 20th international conference companion on World wide web, Seite 5--6. New York, NY, USA, ACM, (2011)
M. Anderka, B. Stein, und N. Lipka. Proceedings of the 20th ACM international conference on Information and knowledge management, Seite 2313--2316. New York, NY, USA, ACM, (2011)
D. Cosley, D. Frankowski, L. Terveen, und J. Riedl. Proceedings of the 12th international conference on Intelligent user interfaces, Seite 32--41. New York, NY, USA, ACM, (2007)