F. Castillo, A. Kordon, G. Smits, B. Christenson, and D. Dickerson. GECCO 2006: Proceedings of the 8th annual conference
on Genetic and evolutionary computation, 2, page 1613--1620. Seattle, Washington, USA, ACM Press, (8-12 July 2006)
F. Castillo, K. Marshall, J. Green, and A. Kordon. GECCO 2002: Proceedings of the Genetic and
Evolutionary Computation Conference, page 1043--1047. New York, Morgan Kaufmann Publishers, (9-13 July 2002)