Abubakirova, Aktolkin, et al. “Relationship Between Oil Prices and Stock Prices in BRICS-T Countries: Symmetric and Asymmetric Causality Analysis”. International Journal of Energy Economics and Policy, vol. 11, no. 3, Apr. 2021, pp. 140-8, https://econjournals.com/index.php/ijeep/article/view/10487.