1. (1) IEEJ Electrotechnical Vocabulary No. 9: “Power electronics”, Corona Publishing Co., Ltd. (2000-2) (in Japanese)
2. (2) “Trends of Uninterruptible Power System”, IEEJ Technical Report, No. 596 (1996-7) (in Japanese)
3. (3) M. Ohshima: “Voltage dip phenomena and development of a novel UPS”, Production and Electricity, Vol. 53, No. 11, pp. 3-8 (2001-11) (in Japanese)
4. (4) M. Ohshima and E. Masada: “Novel Three-Phase Current- Regulated Digital PWM and its Behavioral Analysis”, IEEJ Trans. IA, Vol. 123-D, No. 5, pp. 533-546 (2003-5) (in Japanese)
5. (5) T. Kawabata, T. Miyashita, and Y. Yamamoto: “Multi- Functional Inverter Using High Performance Current Minor Loop”, Proc. of IEE Japan Industry Appl. Soc. Conf., No. 96, pp. 463-468 (1987) (in Japanese)