K. Ramesh, Venu Madhav,. 2013. “Hybrid Selective Harmonic Elimination PWM for Common-ModeVoltage Reduction in Three-Level Neutral-Point-ClampedInverters for Variable Speed Induction Drives”. International Journal of Engineering and Computer Science 2 (10). india. http://ijecs.in/index.php/ijecs/article/view/2103.