Gajanan H. Chavhan, Mangesh S. Deshpande, Rajesh M. Jalnekar 2023. A comprehensive Investigation of Drought and Standard Precipitation Index (SPI). Mathematical Statistician and Engineering Applications. 70, 2 (Jan. 2023), 419–432. DOI:https://doi.org/10.17762/msea.v70i2.1646.