Moyo, Clement, Izunna Anyikwa, and Andrew Phiri. “The Impact of Covid-19 on Oil Market Returns: Has Market Efficiency Being Violated?”. International Journal of Energy Economics and Policy 13, no. 1 (January 22, 2023): 118–127. Accessed April 25, 2024. https://econjournals.com/index.php/ijeep/article/view/13453.