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Variation Characteristics of the Date of First Frost and Last Frost and the Frost-free Period in the Northeast China during 1961-2013
ZHOU Xiao-yu, ZHAO Chun-yu, CUI Yan, LIU Ming-yan, AO Xue, YI Xue, HOU Yi-ling, ZHANG Xin-yi
JOURNAL OF NATURAL RESOURCES . 2017, (3): 494 -506 .  DOI: 10.11849/zrzyxb.20160379