“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): 19-36. https://ijost.upi.edu/index.php/ijost/article/view/324.