GHAMAS, A. Previous restrictions on contracting (in management contracts). اداب الرافدین, [S. l.], v. 19, n. 19, p. 323–340, 1989. DOI: 10.33899/radab.1989.165684. Disponível em: https://radab.uomosul.edu.iq/index.php/radab/article/view/32607. Acesso em: 13 dec. 2025.