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              [1]
            
             
            
                Multilevel converters ——A new bread of power converters. Lai Jih-Sheng,Peng F Z. IEEE-T on Industry Applications . 1996
              
              [2]
            
             
            
                Multilevel converters for large electric drives. Tolbert Leon M. IEEE-T on Industry Applications . 1999
              
              [3]
            
             
            
                Optimal control of three-level PWM inverter. Halasz Sandor. IEEE-T on Industrial Electronics . 1997
              
              [4]
            
             
            
                Power line conditioner using cascade multilevel inverters for distribution system. Peng F Z. IEEE-T on industry Applications . 1998
              

