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Hitoshi Sugawara
Department of Physics, Tokyo Metropolitan University, Minami–Ohsawa 1–1, Hachioji, Tokyo 192–0397
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Yuji Aoki
Department of Physics, Tokyo Metropolitan University, Minami–Ohsawa 1–1, Hachioji, Tokyo 192–0397
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Hideyuki Sato
Department of Physics, Tokyo Metropolitan University, Minami–Ohsawa 1–1, Hachioji, Tokyo 192–0397
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Noriaki Sato
Physics Department, Graduate School of Science, Tohoku University, Sendai 980–8578
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Takemi Komatsubara
Physics Department, Graduate School of Science, Tohoku University, Sendai 980–8578