J. Taylor, J. Rowland, and D. Kell. Proceedings of the 2001 Congress on Evolutionary
Computation CEC2001, page 481--486. COEX, World Trade Center, 159 Samseong-dong,
Gangnam-gu, Seoul, Korea, IEEE Press, (27-30 May 2001)
K. Hennessy, M. Madden, J. Conroy, and A. Ryder. Knowledge Based Systems, 18 (4-5):
217--224(August 2005)AI-2004, Cambridge, England, 13th-15th December 2004.