Laguna-Sánchez, G. A., M. Olguí­n-Carbajal, N. Cruz-Cortés, R. Barrón-Fernández, and J. A. Álvarez-Cedillo. “Comparative Study of Parallel Variants for a Particle Swarm Optimization”. Journal of Applied Research and Technology, vol. 7, no. 03, Dec. 2009, doi:10.22201/icat.16656423.2009.7.03.489.