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Shinsuke Watanabe
Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Yokohama 240
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Shingo Ishiwata
Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Yokohama 240
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Jun–ichi Ehara
Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Yokohama 240
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Saburo Kakei
Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Yokohama 240