Sigdel, M, and M Ikeda. “Spatial and Temporal Analysis of Drought in Nepal Using Standardized Precipitation Index and Its Relationship With Climate Indices”. Journal of Hydrology and Meteorology 7, no. 1 (December 23, 2011): 59–74. Accessed December 7, 2025. https://www.nepjol.info/index.php/JHM/article/view/5617.