Deshi, M. J. ., E. C. Anene, J. T. Agee, and S. M. Hassan. “Performance Evaluation of Single and Three Phase 21-Level Symmetric Cascaded H-Bridge Multilevel Inverter Using Level Shifted POD-PWM Technique”. International Journal of Electrical Engineering and Applied Sciences (IJEEAS), vol. 8, no. 2, Oct. 2025, doi:10.54554/ijeeas.2025.8.02.009.