Central Research Inst. of Electric Power Industry, Tokyo (Japan); Hitachi Ltd., Tokyo (Japan)(Central Research Inst. of Electric Power Industry, Tokyo (Japan); Hitachi Ltd., Tokyo (Japan))1985.
Central Research Inst. of Electric Power Industry, Tokyo (Japan); Hitachi Ltd., Tokyo (Japan)(Central Research Inst. of Electric Power Industry, Tokyo (Japan); Hitachi Ltd., Tokyo (Japan))1984.