M. Rotella

Cascaded Nine-Level Inverter for Hybrid-Series Active Power Filter, Using Industrial Controller

Juan Dixon, Luis Moran, Alexander Varschavsky, 2010, IEEE Transactions on Industrial Electronics.

PWM Method to Eliminate Power Sources in a Nonredundant 27-Level Inverter for Machine Drive Applications

Juan Dixon, Javier Pereda, Mauricio Rotella, 2009, IEEE Transactions on Industrial Electronics.