COMMERCIAL RELATIONS OF DERIVATIVES BETWEEN OIL-OPEC BRAZIL: A PRELIMINARY APPROACH. Revista de Estudos Sociais, [S. l.], v. 22, n. 44, p. 39–57, 2020. DOI: 10.19093/res9809. Disponível em: https://periodicoscientificos.ufmt.br/ojs/index.php/res/article/view/9809. Acesso em: 6 abr. 2025.