S. Narasimha, and M. Sushama. “A Novel Control Method for Improvement of Voltage Utilization Factor in Three-Phase Multilevel Inverter Considering the Input Voltage Fluctuation”. Global Journals of Research in Engineering, vol. 15, no. F3, Mar. 2015, pp. 1-9, https://engineeringresearch.org/index.php/GJRE/article/view/1296.