Advances in Artificial Life 5th European Conference, ECAL'99, Lausanne, Switzerland, September 13-17, 1999 Proceedings - Floreano, Dario; Floreano, Dario; Nicoud, Jean-Daniel; Nicoud, Jean-Daniel; Mondada, Francesco; Mondada, Francesco (Springer Berlin Heidelberg : Imprint: Springer, 1999)