Mofema, Victor Mbua, and Gisele Mah. “An Empirical Analysis of Volatility in South African Oil Prices”. Journal of Energy in Southern Africa 32, no. 3 (September 19, 2021): 67–75. Accessed July 22, 2024. https://journals.assaf.org.za/index.php/jesa/article/view/8852.