Assessment of severity of drought in some northern Nigeria states using Drought Severity Index (DSI5). Ghana Journal of Science, Technology and Development, [S. l.], v. 4, n. 2, p. 1–10, 2016. DOI: 10.47881/84.967x. Disponível em: https://gjstd.org/index.php/GJSTD/article/view/84. Acesso em: 9 sep. 2025.