An application of SPI (Standardized Precipitation Index) to monthly rainfall data in Pernambuco between 1991-2019. Research, Society and Development, [S. l.], v. 12, n. 9, p. e8912943217, 2023. DOI: 10.33448/rsd-v12i9.43217. Disponível em: https://ojs34.rsdjournal.org/index.php/rsd/article/view/43217. Acesso em: 28 jun. 2025.