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H. Hibino
NTT Basic Research Laboratories, NTT Corporation, Japan
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H. Kageshima
NTT Basic Research Laboratories, NTT Corporation, Japan
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F. Maeda
NTT Basic Research Laboratories, NTT Corporation, Japan
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M. Nagase
NTT Basic Research Laboratories, NTT Corporation, Japan
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Y. Kobayashi
NTT Basic Research Laboratories, NTT Corporation, Japan
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Y. Kobayashi
NTT Basic Research Laboratories, NTT Corporation, Japan
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H. Yamaguchi
NTT Basic Research Laboratories, NTT Corporation, Japan