W. Hordijk, и B. Manderick. Advances in Artificial Life, Proceedings of the Third
European Conference on Artificial Life, стр. pp. 908‒919. Springer-Verlag, (1995)
L. Yaeger. Artificial Life III, Vol. XVII of SFI Studies in the
Sciences of Complexity, Santa Fe Institute, стр. 263--298. Los Alamos, New Mexico, Addison-Wesley, (1993)
R. Poli, W. Langdon, и N. McPhee. Published via http://lulu.com and freely
available at
http://www.gp-field-guide.org.uk, (2008)(With contributions by J. R. Koza).