Medeiros Pina Ximenes, P. de S., Alves da Silva, A. S., Stosic, T., de Amorim, J. F., & Cezar Menezes, R. S. (2019). Analysis of drought severity in Agreste Pernambucano using standardized precipitation index. Sigmae, 8(2), 331–339. Retrieved from http://publicacoes.unifal-mg.edu.br/revistas/index.php/sigmae/article/view/950