JOURNAL SYSTEME, Journal systeme. 10 - journal system. Africa Development, [S. l.], v. 1, n. 3, 1976. DOI: 10.57054/ad.v1i3.3439. Disponível em: https://journals.codesria.org/index.php/ad/article/view/3439. Acesso em: 3 jul. 2024.