Fevrier Valdez Patricia Melin Oscar Castillo Fuzzy Logic for Combining Particle Swarm Optimization and Genetic Algorithms: Preliminary Results. 444-453 2009 MICAI http://dx.doi.org/10.1007/978-3-642-05258-3_39 conf/micai/2009 db/conf/micai/micai2009.html#ValdezMC09