JOURNAL SYSTEM. AD, Volume 15, n° 1, 1990 - Full Issue. Africa Development, [S. l.], v. 15, n. 1, 1990. DOI: 10.57054/ad.v15i1.1980. Disponível em: https://journals.codesria.org/index.php/ad/article/view/1980. Acesso em: 1 aug. 2025.