Promping, T., C. Foyhirun, and T. Tingsanchali. “Assessing climate change impacts on meteorological drought indices for agricultural areas in Chi River Basin, Thailand: Comparative analysis of standardized precipitation index and standardized precipitation evapotranspiration index”. Agriculture and Natural Resources, vol. 59, no. 4, Aug. 2025, p. 590411, https://li01.tci-thaijo.org/index.php/anres/article/view/268635.