Temporal and spatial analysis of drought for recent 50 years in Loess Plateau of Gansu province based on meteorological drought composite index
ZHANG Tiaofeng, ZHANG Bo, WANG Xiaomin, JIA Jianying, YIN Haixia, HE Xuqiang
Ecology and Environment . 2012, (1): 13 -20 .  DOI: 10.16258/j.cnki.1674-5906(2012)01-0013-08

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