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(3) Y. Nakajima, et al.: “Single-Phase UPS using modified half bridge converter”, 1999 National Convention Record, IEE Japan, No. 916 (1999-3) (in Japanese)
(4) H. Kiyotake, et al.: “Characteristics of Shingle-Phase Voltage-Doubler Rectifier with Balanced Capacitor Voltages”, T. IEE Japan, Vol. 121-D, No. 9, pp. 964-969 (2001-9) (in Japanese)