K. Yanai, and H. Iba. GECCO 2005: Proceedings of the 2005 conference on
Genetic and evolutionary computation, 2, page 1775--1776. Washington DC, USA, ACM Press, (25-29 June 2005)
W. Langdon, and W. Banzhaf. Late Breaking Papers at the 2004 Genetic and
Evolutionary Computation Conference, Seattle, Washington, USA, AAAI, (26 July 2004)