P. Stalph, M. Butz, and G. Pedersen. Proceedings of the 32nd German Conference on Artificial Intelligence (KI-2009), volume 5803 of Lecture Notes in Computer Science, page 193--200. Springer, (2009)
M. Butz, G. Pedersen, and P. Stalph. GECCO '09: Proceedings of the 11th Annual Conference on Genetic and Evolutionary Computation, page 1171--1178. (2009)