E. Brucherseifer, P. Bechtel, S. Freyer, and P. Marenbach. Genetic Programming, Proceedings of EuroGP'2001, volume 2038 of LNCS, page 268--279. Lake Como, Italy, Springer-Verlag, (18-20 April 2001)
S. Christensen, and F. Oppacher. GECCO '07: Proceedings of the 9th annual conference on
Genetic and evolutionary computation, 2, page 1574--1579. London, ACM Press, (7-11 July 2007)
W. Cohen, and Y. Singer. 19th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, page 307--315. Zürich, CH, ACM Press, New York, US, (1996)
B. Edmonds, and S. Moss. Artificial Neural Networks - ICANN 2001 :
International Conference, Proceedings, volume 2130 of Lecture Notes in Computer Science, page 759--766. Vienna, Austria, (August 2001)