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*Toshimitsu Sakurai
Institute of Low Temperature Science, Hokkaido University
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Atsushi Miyamoto
Institute of Low Temperature Science, Hokkaido University
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Yoshinori Iizuka
Institute of Low Temperature Science, Hokkaido University
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Tsutomu Uchida
Department of Applied Physics, Faculty of Engineering, Hokkaido University
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Shuji Fujita
National Institute of Polar Research
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Takeo Hondoh
Institute of Low Temperature Science, Hokkaido University