Advances in Artificial Intelligence - IBERAMIA-SBIA 2006 : 2nd International Joint Conference, 10th Ibero-American Conference on AI, 18th Brazilian AI Symposium, Ribeirao Preto, Brazil, October 23-27, 2006 - Jaime Simão Sichman, Helder Coelho, Solange Oliveira Rezende ((Lecture Notes in Computer Science))