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*ROBERTO TOKUNAGA
Civil Engineering Research Institute for Cold Region, PWRI, IAA
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MAKOTO KIRIISHI
Civil Engineering Research Institute for Cold Region, PWRI, IAA
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YUICHI KAWABATA
Civil Engineering Research Institute for Cold Region, PWRI, IAA
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NAOTO TAKAHASHI
Civil Engineering Research Institute for Cold Region, PWRI, IAA
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KOJI FUSE
Civil Engineering Research Institute for Cold Region, PWRI, IAA