MUSTAPHA, Umar M. The Role of Speculation in the Determination of Energy Prices. International Journal of Energy Economics and Policy, [S. l.], v. 2, n. 4, p. 279–291, 2012. Disponível em: https://mail.econjournals.com/index.php/ijeep/article/view/258. Acesso em: 23 dec. 2024.