M. Khoury, F. Guerin, and G. Coghill. Genetic and Evolutionary Computation Conference
(GECCO2007) workshop program, page 2769--2776. London, United Kingdom, ACM Press, (7-11 July 2007)
A. Loizides, M. Slater, and W. Langdon. Soft Computing and Industry Recent Applications, page 545--554. Springer-Verlag, (10--24 September 2001)Published 2002.
T. Recio, and M. González-López. ISSAC '94: Proceedings of the 1994 International Symposium on Symbolic
and Algebraic Computation: July 20--22, 1994, Oxford, England, United
Kingdom, page 354--358. New York, NY 10036, USA, ACM Press, (1994)