SYSTEM, Journal. 11- ECONOMIC DEVELOPMENT INSTITUTE. Africa Development, [S. l.], v. 2, n. 4, 1977. DOI: 10.57054/ad.v2i4.3502. Disponível em: https://journals.codesria.org/index.php/ad/article/view/3502. Acesso em: 30 jun. 2024.