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K. Oyama
Institute of Applied Physics. University of Tsukuba
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N. Kuroda
Institute of Applied Physics. University of Tsukuba
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H. Ikeda
Institute of Applied Physics. University of Tsukuba:Unversity of Tsukuba, Cryogenics Center
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R. Yoshizaki
Institute of Applied Physics. University of Tsukuba:Unversity of Tsukuba, Cryogenics Center