Derbali, Abdelkader, Shan Wu, and Lamia Jamel. 2020. “OPEC News and Predictability of Energy Futures Returns and Volatility: Evidence from a Conditional Quantile Regression”. Journal of Economics, Finance and Administrative Science 25 (50):239-59. https://revistas.esan.edu.pe/index.php/jefas/article/view/42.