Leonardo Vanneschi Steven Gustafson Alberto Moraglio Ivanoe De Falco Marc Ebner Genetic Programming, 12th European Conference, EuroGP 2009, Tübingen, Germany, April 15-17, 2009, Proceedings 5481 2009 http://dx.doi.org/10.1007/978-3-642-01181-8 978-3-642-01180-1 EuroGP Lecture Notes in Computer Science Springer db/conf/eurogp/eurogp2009.html