G. A. Laguna-Sánchez, M. Olguí­n-Carbajal, N. Cruz-Cortés, R. Barrón-Fernández, and J. A. Álvarez-Cedillo, “Comparative Study of Parallel Variants for a Particle Swarm Optimization”, JART, vol. 7, no. 03, Dec. 2009.