Dinakara Prasad Reddy, P., and B. Chandra Sekhar. “Maximum Annual Savings in Radial Distribution Systems Using Firefly Algorithm”. Power Research - A Journal of CPRI, vol. 12, no. 3, July 2016, pp. 481-6, https://node6473.myfcloud.com/~geosocin/CPRI/index.php/pr/article/view/307.