ECAI 2006 17th European Conference on Artificial Intelligence, August 29-September 1, 2006, Riva del Garda, Italy : including Prestigious Applications of Intelligent Systems (PAIS 2006) : proceedings - Brewka, Gerhard 1955-; Cordeschi, Silvia; Perini, Anna; Traverso, Paolo (Frontiers in artificial intelligence and applications, 2006)