Suleymanli, J. E., Rahimli, E. M., & Akbulaev, N. N. (2020). The Causality Analysis of the Effect of Oil and Natural Gas Prices on Ukraine Stock Index. International Journal of Energy Economics and Policy, 10(4), 108–114. Retrieved from https://mail.econjournals.com/index.php/ijeep/article/view/9156