Maarten Keijzer Una-May O'Reilly Simon M. Lucas Ernesto Costa Terence Soule Genetic Programming, 7th European Conference, EuroGP2004, Coimbra, Portugal, April 5-7, 2004, Proceedings EuroGP Lecture Notes in Computer Science 3003 Springer 2004 3-540-21346-5 db/conf/eurogp/eurogp2004.html