R. Salustowicz, and J. Schmidhuber. Proceedings of the Genetic and Evolutionary
Computation Conference, 2, page 1184--1191. Orlando, Florida, USA, Morgan Kaufmann, (13-17 July 1999)
J. Pujol, and R. Poli. Proceedings of the Genetic and Evolutionary
Computation Conference, 2, page 1170--1177. Orlando, Florida, USA, Morgan Kaufmann, (13-17 July 1999)