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*Hirotaka Takechi
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Masaru Matsuzawa
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Manabu Kaneko
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Yasuhiko Ito
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Tetsuya Kokubu
Civil Engineering Research Institute for Cold Region, P.W.R.I.