Reduction of THD in Diode Clamped Multilevel Inverter employing SPWM technique
Multilevel inverters: a survey of topologies, controls, and applications
Multilevel PWM Methods at Low Modulation Indices
Multilevel Converters for Large Electric Drives
Novel Multilevel Inverter Carrier-Based PWM Method
A New Neutral-Point-Clamped PWM Inverter