W. Langdon, and W. Banzhaf. Late Breaking Papers at the 2004 Genetic and
Evolutionary Computation Conference, Seattle, Washington, USA, AAAI, (26 July 2004)
J. Daida. GECCO 2006: Proceedings of the 8th annual conference
on Genetic and evolutionary computation, 1, page 799--806. Seattle, Washington, USA, ACM Press, (8-12 July 2006)