Min, A. K., and Y. A. Oo. “Voltage Stability Assessment of Power System With Distributed Generation in Free and Open Source Software”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 26, no. 2, Nov. 2016, pp. 283-00, https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/2258.