JOURNAL SYSTEM. AD, Volume 14, n° 4, 1989 - Full Issue. Africa Development, [S. l.], v. 14, n. 4, 1989. DOI: 10.57054/ad.v14i4.1981. Disponível em: https://journals.codesria.org/index.php/ad/article/view/1981. Acesso em: 19 jun. 2025.