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Spatial-temporal characteristics of drought in Heilongjiang Province based on standardized precipitation index
YU Jia-rui, AI Ping, YUAN Ding-bo, XIONG Chuan-sheng
Arid Land Geography . 2019, (5): 1059 -1068 .  DOI: 10.12118/j.issn.1000-6060.2019.05.11