MR. GAJANAN H. CHAVHAN, MANGESH S. DESHPANDE, RAJESH M. JALNEKAR. A comprehensive Investigation of Drought and Standard Precipitation Index (SPI). Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 10058–10068, 2023. DOI: 10.17762/msea.v71i4.1821. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/1821. Acesso em: 6 may. 2024.