D. Vallet, M. Fernández, P. Castells, P. Mylonas, and Y. Avrithis. 21st National Conference on Artificial Intelligence - 3rd International Workshop on Modeling and Retrieval of Context, Boston, USA, 16-17 July 2006, (2006)
T. Athanasiadis, P. Mylonas, and Y. Avrithis. Proceedings of SAMT 2006, volume 4306 of Lecture Notes in Computer Science, page 212-225. Springer, (2006)