WILMOT, N. A. Cointegration in the Oil Market Among Regional Blends. International Journal of Energy Economics and Policy, [S. l.], v. 3, n. 4, p. 424–433, 2013. Disponível em: https://www.econjournals.com/index.php/ijeep/article/view/592. Acesso em: 8 may. 2024.