K. Zachos, N. Maiden, X. Zhu, and S. Jones. Conference on Advanced Information Systems Engineering (CAiSE'07), page 142--157. Trondheim, Norway, (June 2007)
L. Jones, S. Al-Sakran, and J. Koza. GECCO 2006: Proceedings of the 8th annual conference
on Genetic and evolutionary computation, 1, page 823--830. Seattle, Washington, USA, ACM Press, (8-12 July 2006)