C. Ziegler, G. Lausen, and L. Schmidt-Thieme. Proceedings of the 2004 ACM CIKM Conference on Information and Knowledge
Management, page 406--415. (2004)
A. Schein, A. Popescul, L. Ungar, and D. Pennock. Proceedings of the 25th annual international ACM SIGIR conference
on Research and development in information retrieval, (253--260)
N. Kushmerick, J. McKee, and F. Toolan. Proceedings of the International Conference on Adaptive Hypermedia
and Adaptive Web-based Systems, page 133--143. (2000)
J. Herlocker, J. Konstan, A. Borchers, and J. Riedl. Proceedings of the 22nd Annual International ACM SIGIR Conference
on Research and Development in Information Retrieval, (1999)