Fernando Almeida e Costa Luis Mateus Rocha Ernesto Costa Inman Harvey António Coutinho Advances in Artificial Life, 9th European Conference, ECAL 2007, Lisbon, Portugal, September 10-14, 2007, Proceedings ECAL Lecture Notes in Computer Science 4648 Springer 2007 978-3-540-74912-7 db/conf/ecal/ecal2007.html