O. Rostanin, C. Ullrich, H. Holz, and S. Song. Proceedings: I-KNOW'06, 6th International Conference on Knowledge
Management, page 395--402. Graz, Austria, (September 2006)
K. Reinhardt, S. Apelt, and M. Specht. Adaptive Hypermedia and Adaptive Web-Based Systems: Third International
Conference, AH 2004, Eindhoven, The Netherlands, August 23-26, 2004, (2004)