JOURNAL SYSTEM. 9 - Index to Africa Development: Vol. XIV, No 1-4,1989. Africa Development, [S. l.], v. 15, n. 1, 1990. DOI: 10.57054/ad.v15i1.2792. Disponível em: https://journals.codesria.org/index.php/ad/article/view/2792. Acesso em: 12 mar. 2025.