Gopal, Y., K. P. Panda, D. Birla, and M. Lalwani. “Swarm Optimization-Based Modified Selective Harmonic Elimination PWM Technique Application in Symmetrical H-Bridge Type Multilevel Inverters”. Engineering, Technology & Applied Science Research 9, no. 1 (February 16, 2019): 3836–3845. Accessed September 28, 2021. https://etasr.com/index.php/ETASR/article/view/2397.