C. Di Chio, R. Poli, and W. Langdon. AI*IA Workshop on Evolutionary Computation,
Evoluzionistico GSICE05, University of Milan Bicocca, Italy, (20 September 2005)
W. Langdon, R. Poli, O. Holland, and T. Krink. Proceedings SIS 2005 IEEE Swarm Intelligence, page 30--37. Pasadena, California, USA, IEEE, (8-10 June 2005)