XU YANG, XIAOHOU SHAO, XINYU MAO, XIUNENG LI, and RONGQI LI. “An Analysis of Drought Evolution Characteristics Based on Standardized Precipitation Index: A Case Study in Southwest Guizhou Autonomous Prefecture, China”. Journal of Agrometeorology, vol. 21, no. 3, Sept. 2019, pp. 327-35, doi:10.54386/jam.v21i3.255.