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Shin–ichi Kondo
Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910
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Shinji Matsuoka
Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910
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Tadaaki Saito
Department of Applied Physics, Faculty of Engineering, Fukui University, Bunkyo, Fukui 910