N. Jin. GECCO 2006: Proceedings of the 8th annual conference
on Genetic and evolutionary computation, 1, page 383--384. Seattle, Washington, USA, ACM Press, (8-12 July 2006)
N. Drechsler, F. Schmiedle, D. Grosse, and R. Drechsler. Genetic Programming, Proceedings of EuroGP'2001, volume 2038 of LNCS, page 1--10. Lake Como, Italy, Springer-Verlag, (18-20 April 2001)