Ramiro Serrato Paniagua Juan J. Flores Carlos A. Coello Coello A Genetic Representation for Dynamic System Qualitative Models on Genetic Programming: A Gene Expression Programming Approach. 30-40 2007 MICAI http://dx.doi.org/10.1007/978-3-540-76631-5_4 db/conf/micai/micai2007.html#PaniaguaFC07