“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” (2022) Indonesian Journal of Science and Technology, 7(1), pp. 19–36. Available at: https://ijost.upi.edu/index.php/ijost/article/view/324 (Accessed: 7 June 2026).