Daniel Manrique Fernando Márquez Juan Rios Alfonso Rodríguez-Patón Grammar Based Crossover Operator in Genetic Programming. 252-261 2005 conf/iwinac/2005-2 IWINAC (2) http://dx.doi.org/10.1007/11499305_26 db/conf/iwinac/iwinac2005-2.html#ManriqueMRR05