Progress in Artificial Intelligence 13th Portuguese Conference on Aritficial Intelligence, EPIA 2007, Workshops: GAIW, AIASTS, ALEA, AMITA, BAOSW, BI, CMBSB, IROBOT, MASTA, STCS, and TEMA, Guimarães, Portugal, December 3-7, 2007. Proceedings - Neves, José; Santos, Manuel Filipe; Machado, José Manuel (Springer Berlin Heidelberg, 2007)