R. Wetzker, C. Zimmermann, C. Bauckhage, und S. Albayrak. WSDM '10: Proceedings of the Third ACM International Conference on Web Search and Data Mining, Seite 71--80. New York, NY, USA, ACM, (2010)
K. Schoefegger, P. Seitlinger, und T. Ley. Proceedings of the 1st Workshop on Recommender Systems for Technology Enhanced Learning (RecSysTEL 2010), 1, Seite 2829 - 2838. (07.09.2010)
M. Szomszor, I. Cantador, und H. Alani. Proceedings of the 19th ACM Conference on Hypertext and Hypermedia (Hypertext 2008), Seite 33--42. New York, NY, USA, ACM, (Juni 2008)