Zaheer, S., S. Haroon, T. N. Malik, and I. Hashmi. “REVIEW ON THE IMPLEMENTATION OF PARTICLE SWARM OPTIMIZATION TECHNIQUE IN SOLVING THE HYDROTHERMAL SCHEDULING”. The Nucleus, vol. 50, no. 1, Mar. 2013, pp. 13-19, http://thenucleuspak.org.pk/index.php/Nucleus/article/view/771.