W. Langdon. Genetic Programming 1996: Proceedings of the First
Annual Conference, стр. 141--148. Stanford University, CA, USA, MIT Press, (28--31 July 1996)
W. Langdon. Genetic Algorithms: Proceedings of the Sixth
International Conference (ICGA95), стр. 295--302. Pittsburgh, PA, USA, Morgan Kaufmann, (15-19 July 1995)
D. Howard. Proceedings of the 8th International Conference on
Knowledge-Based Intelligent Information and Engineering
Systems Conference, KES 2004, Part III, том 3215 из Lecture Notes in Artificial Intelligence, стр. 217--223. Springer, (сентября 2004)