F. Abel, I. Bittencourt, N. Henze, D. Krause, and J. Vassileva. Adaptive Hypermedia and Adaptive Web-Based Systems, 5th
International Conference, AH 2008, Hannover, Germany, July
29 - August 1, 2008. Proceedings, volume 5149 of Lecture Notes in Computer Science, page 12-21. Springer, (2008)
E. Leonardi, J. Hidders, G. Houben, F. Abel, and E. Herder. User Modeling, Adaptation, and Personalization, 18th International
Conference, UMAP 2010, Big Island, HI, USA, June 20-24,
2010, Demo and Poster Track, (2010)