JOURNAL SYSTEM. 6 - THE RESEARCH CENTER OF CARYOUNIS UNIVERSITY, LIBYA. Africa Development, [S. l.], v. 3, n. 3, 1978. DOI: 10.57054/ad.v3i3.3492. Disponível em: https://journals.codesria.org/index.php/ad/article/view/3492. Acesso em: 17 may. 2024.