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T. Oguchi
Department of Physics, Tokyo Gakugei University
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T. Ohata
Department of Physics, Tokyo Gakugei University
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A. Yamaguchi
The University of Tokyo
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I. Kanazawa
Department of Physics, Tokyo Gakugei University
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T. Iwashita
Department of Physics, Tokyo Gakugei University
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R. Yamamoto
The University of Tokyo, Research Center for Advanced Science and Technology