Roque Marín, Eva Onaindia, Alberto Bugarín, José Santos Reyes: Current Topics in Artificial Intelligence, 11th Conference of the Spanish Association for Artificial Intelligence, CAEPIA 2005, Santiago de Compostela, Spain, November 16-18, 2005, Revised Selected Papers. Lecture Notes in Computer Science 4177, Springer 2006, ISBN 3-540-45914-6