JOURNAL SYSTEM. AD, Volume 15, n° 2, 1990 - Full Issue. Africa Development, [S. l.], v. 15, n. 2, 1990. DOI: 10.57054/ad.v15i2.1979. Disponível em: https://journals.codesria.org/index.php/ad/article/view/1979. Acesso em: 19 may. 2024.