الجناني ع. ن.; الجابري ق. ع. ف. Estimated returns and risks of oil prices Volatility in the international market for the period (1990 – 2017) . Journal of Petroleum Research and Studies, [S. l.], v. 11, n. 2, p. 36-54, 2021. DOI: 10.52716/jprs.v11i2.502. Disponível em: https://jprs.gov.iq/index.php/jprs/article/view/502. Acesso em: 27 apr. 2024.