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*Roberto Tokunaga
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Akihiro Fujimoto
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Makoto Kiriishi
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Naoto Takahashi
Civil Engineering Research Institute for Cold Region, P.W.R.I.
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Tateki Ishida
Civil Engineering Research Institute for Cold Region, P.W.R.I.