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(2) A. Odaka, I. Sato, H. Ohguchi, Y. Tamai, H. Mine, and J. Itoh: “A PAM Control Method for the Matrix Converter Based on Virtual AC/DC/AC Conversion Method”, IEEJ Trans., Vol. 126-D, No. 9, pp. 1185-1192 (2006-9) (in Japanese)