Julio Barrera Carlos A. Coello Coello A Particle Swarm Optimization Method for Multimodal Optimization Based on Electrostatic Interaction. 622-632 2009 MICAI http://dx.doi.org/10.1007/978-3-642-05258-3_55 conf/micai/2009 db/conf/micai/micai2009.html#BarreraC09