Z. Yu, X. Zhou, and Y. Nakamura. Ubiquitous Intelligence and Computing, volume 5061 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2008)
T. Yu, and J. Miller. GECCO 2002: Proceedings of the Genetic and
Evolutionary Computation Conference, page 704. New York, Morgan Kaufmann Publishers, (9-13 July 2002)