SARWAT, S.; KASHIF, M.; AQIL, M.; AHMED, F. Determination of Causality in Prices of Crude Oil. International Journal of Energy Economics and Policy, [S. l.], v. 9, n. 4, p. 298–304, 2019. Disponível em: https://econjournals.com/index.php/ijeep/article/view/7724. Acesso em: 24 apr. 2024.