Development of Fuzzy Membership Functions and Meteorological Drought Classification as per SPI. Global Journal of Science Frontier Research, [S. l.], v. 21, n. F3, p. 73–80, 2021. Disponível em: https://www.journalofscience.org/index.php/GJSFR/article/view/2962. Acesso em: 14 aug. 2026.