B. Zhang, and H. Jang. GECCO 2005: Proceedings of the 2005 conference on
Genetic and evolutionary computation, 2, page 1761--1768. Washington DC, USA, ACM Press, (25-29 June 2005)
J. Walker, and J. Miller. Genetic Programming 7th European Conference, EuroGP
2004, Proceedings, volume 3003 of LNCS, page 187--197. Coimbra, Portugal, Springer-Verlag, (5-7 April 2004)