TANSEY, M. M.; TOURAY, A. The Gravity Model Of Trade Applied To Africa. International Business & Economics Research Journal (IBER), [S. l.], v. 9, n. 3, 2010. DOI: 10.19030/iber.v9i3.543. Disponível em: https://clutejournals.com/index.php/IBER/article/view/543. Acesso em: 17 jul. 2024.