G. Wilson, and M. Heywood. IEEE CCECE 2002: IEEE Canadian Conference on
Electrical and Computer Engineering, 2, page 809--814. IEEE Press, (12-15 May 2002)
W. Langdon. Genetic Programming 1996: Proceedings of the First
Annual Conference, page 141--148. Stanford University, CA, USA, MIT Press, (28--31 July 1996)