The Temporal and Spatial Characteristics of Summer Drought in the Loess Plateau Based on SPEI
ZHANG Yongrui,ZHANG Yuejun,JIN Zehui,KANG Xi
Ecology and Environmental Sciences . 2019, (7): 1322 -1331 .  DOI: 10.16258/j.cnki.1674-5906.2019.07.005

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