Dr. Carlos Ruiz, “Digital PWM-Controlled Seven-Level Symmetrical Multilevel Inverter for Improved Power Quality and Efficiency”, Int. Res. Jour. of Com. & Ele. Engg., vol. 9, no. 2, p. 8088, Oct. 2022, Accessed: Oct. 21, 2026. [Online]. Available: https://urgcee.org/index.php/ircee/article/view/76