@proceedings { geffner08, address = {Lisbon, Portugal}, keywords = {artificial intelligence, ibero-american}, month = {October}, publisher = {Springer}, title = {Advances in Artificial Intelligence, 11th Ibero-American Conference on AI, IBERAMIA'2008}, volume = {Proceedings Series: Lecture Notes in Artificial Intelligence, Vol. 5290}, year = {2008}, author = {Hector Geffner and Rui Prada and Isabel Machado Alexandre and Nuno David} }