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Michisuke Kobayashi
Department of Physics, Niigata University, Niigata 950–21
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Osamu Sato
Graduate School of Science and Technology, Niigata University, Niigata 950–21
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Yukio Tanaka
Department of Physics, Niigata University, Niigata 950–21
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Akira Hasegawa
College of General Education, Niigata University, Niigata 950–21