M S Sujatha, and S Sreelakshmi. “Mitigation of Harmonics for Eleven-Level Cascaded Multilevel Inverter Using SPWM and SHE Techniques”. Helix - The Scientific Explorer | Peer Reviewed Bimonthly International Journal, vol. 10, no. 02, Apr. 2020, pp. 168-77, https://helixscientific.pub/index.php/home/article/view/128.