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M. Akamatsu
Institute of Applied Physics, Univ.of Tsukuba
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H. Kuwahara
Institute of Applied Physics, Univ.of Tsukuba : SANYO Tsukuba Research Center
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R. Yoshizaki
Institute of Applied Physics, Univ.of Tsukuba
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H. Ikeda
Institute of Applied Physics, Univ.of Tsukuba