J. van Hemert, and M. Jansen. Proceedings of the Genetic and Evolutionary
Computation Conference (GECCO-2001), page 177. San Francisco, California, USA, Morgan Kaufmann, (7-11 July 2001)
T. Unemi. Third International Conference on Knowledge-Based
Intelligent Information Engineering Systems, KES 1999, page 288--291. Adelaide, Australia, IEEE, (31 August-1 September 1999)