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Spatial and temporal variations of drought in northern and southern regions of Qinling Mountains based on standardized precipitation evapotranspiration index
GAO Tao-tao, YIN Shu-yan, WANG Shui-xia
干旱区地理 . 2018, (4): 761 -770 .  DOI: 10.12118/j.issn.1000-6060.2018.04.11