K. Cardinaels, M. Meire, and E. Duval. WWW '05: Proceedings of the 14th international conference on World Wide Web, page 548--556. New York, NY, USA, ACM, (2005)
K. Verbert, J. Klerkx, M. Meire, J. Najjar, and E. Duval. On the Move to Meaningful Internet Systems 2004, volume 3292 of Lecture Notes in Computer Science, page 713-722. Berlin, Heidelberg, Springer, (2004)