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XU YANG, XIAOHOU SHAO, XINYU MAO, XIUNENG LI and RONGQI LI 2019. An analysis of drought evolution characteristics based on standardized precipitation index: a case study in Southwest Guizhou Autonomous Prefecture, China. Journal of Agrometeorology. 21, 3 (Sep. 2019), 327–335. DOI:https://doi.org/10.54386/jam.v21i3.255.