R. Tuchinda, P. Szekely, und C. Knoblock. Proceedings of the 13th international conference on Intelligent user interfaces(IUI), Seite 139--148. New York, NY, USA, ACM, (2008)
P. Symeonidis, A. Nanopoulos, und Y. Manolopoulos. RecSys '08: Proceedings of the 2008 ACM conference on Recommender systems, Seite 43--50. New York, NY, USA, ACM, (2008)