“A New Multicarrier Sinusoidal Pulse Width Modulation (SPWM) Strategy based on Rooted Tree Optimization (RTO) Algorithm for Reducing Total Harmonic Distortion (THD) of Switched-Capacitor Nine-level Inverter in Grid-connected PV systems”, Indones. j. sci. technol., vol. 7, no. 1, pp. 19–36, Apr. 2022, Accessed: Jun. 07, 2026. [Online]. Available: https://ijost.upi.edu/index.php/ijost/article/view/324