C. Clack, J. Farringdon, P. Lidwell, and T. Yu. Research Note, RN/96/48. University College London, Computer Science, Gower Street, London, WC1E 6BT, UK, (June 1996)
R. Moustafa, K. De Jong, and E. Wegman. Proceedings of the Genetic and Evolutionary
Computation Conference, 1, page 798. Orlando, Florida, USA, Morgan Kaufmann, (13-17 July 1999)