1. (1) K. Coelho and I. Barbi: “A three level double-ended forward converter”, in Power Electronics Specialist Conference, 2003. PESC'03. 2003 IEEE 34th Annual, Vol. 3 (2003)
2. (2) K. Coelho and I. Barbi: “A three level double-ended flyback converter”, in Industrial Electronics, 2003. ISIE'03. 2003 IEEE International Symposium on, Vol. 1, pp. 651-655, Vol. 1 (2003)
3. (3) A. J. B. Bottion: “Conversores cc-cc básicos näo isolados de três níeis”, Master's thesis, Universidade Federal de Santa Catarina-UFSC, Instituto de Eletrônica de Potência-INEP (2005)
4. (4) R. S. Gemmen: “Analisys for the effect of inverter ripple current on fuel cell operating condition”, ASME 2001—International Mechanical Engineering Congress and Exposition, pp. 1-12 (2001)
5. (5) A. M. Tuckey and J. N. Krase: “A low-cost inverter for domestic fuel cell applications”, In: IEEE Power Electronics Specialists Conference-PESC'02, pp. 339-346 (2002)