M. Butz, G. Pedersen, and P. Stalph. GECCO '09: Proceedings of the 11th Annual Conference on Genetic and Evolutionary Computation, page 1171--1178. (2009)
J. Drugowitsch, and A. Barry. GECCO '07: Proceedings of the 9th annual conference on
Genetic and evolutionary computation, 2, page 1596--1603. London, ACM Press, (7-11 July 2007)