J. Koza, S. Al-Sakran, und L. Jones. GECCO 2005: Proceedings of the 2005 conference on
Genetic and evolutionary computation, 2, Seite 1953--1960. Washington DC, USA, ACM Press, (25-29 June 2005)
L. Jones, S. Al-Sakran, und J. Koza. Genetic Programming Theory and Practice III, Volume 9 von Genetic Programming, Kapitel 3, Springer, Ann Arbor, (12-14 May 2005)