YOUSEF, N. A. Demand for Oil Products in OPEC Countries: A Panel Cointegration Analysis. International Journal of Energy Economics and Policy, [S. l.], v. 3, n. 2, p. 168–177, 2013. Disponível em: https://econjournals.com/index.php/ijeep/article/view/419. Acesso em: 28 apr. 2024.