1. (1) G. Carrara, S. Gardella, M. Marchesoni, R. Salutari, and G. Sciutto: “A New Multilevel PWM Method: A Theoretical Analysis”, IEEE Trans. Power Electron., Vol. 7, No. 3, pp. 497-505 (1992)
2. (2) D. G. Holmes and B. P. McGrath: “Opportunities for Harmonic Cancellation with Carrier Based PWM for Two-Level and Multi-Level Cascaded Inverters”, Thirty-Fourth IAS Annual Meeting 1999, Vol. 2, pp. 781-788 (1999)
3. (3) K. T. Wong: “Harmonic analysis of PWM multi-level converters”, Electric Power Applications, IEE Proceedings, Vol. 148, No. 1, pp. 35-43 (2001)
4. (4) B. P. McGrath and D. G. Holmes: “An Analytical Technique for the Determination of Spectral Components of Multilevel Carrier-Based PWM Methods”, IEEE Trans. Ind. Electron., Vol. 49, No. 4, pp. 847-857 (2002)
5. (5) J.-S. Lai and F. Z. Peng: “Multilevel Converters-A New Breed of Power Converters”, IEEE Trans. Ind. Appl., Vol. 32, No. 3, pp. 509-517 (1996)