Characteristics and prediction method of first frost of ground in Heilongjiang Province
ZHANG Jian, XU Liling, BAN Jin, LU Yan, WANG Zhen, ZHANG Chunmei
Journal of Glaciology and Geocryology . 2019, (3): 629 -636 .  DOI: 10.7522/j.issn.1000-0240.2019.0038

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