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Naoto KAWAI
Department of Physics, Faculty of Engineering Science, Osaka University
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Katsumi YASKAWA
Department of Physics, Faculty of Engineering Science, Osaka University
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Tadashi NAKAJIMA
Department of Physics, Faculty of Engineering Science, Osaka University
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Masayuki TORII
Department of Physics, Faculty of Engineering Science, Osaka University
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Shoji HORIE
Otsu Hydro-Biological Station, University of Kyoto