JOURNAL SYSTEM. AD, Volume 12, n° 4, 1987 - Full Issue. Africa Development, [S. l.], v. 12, n. 4, 1987. DOI: 10.57054/ad.v12i4.1991. Disponível em: https://journals.codesria.org/index.php/ad/article/view/1991. Acesso em: 27 jul. 2025.