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Katsuhiko Takegahara
Department of Materials Science and Technology, Hirosaki University, Hirosaki, Aomori 036-8561
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Hisatomo Harima
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047
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Akira Yanase
The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047