Moyo C, Anyikwa I, Phiri A. The Impact of Covid-19 on Oil Market Returns: Has Market Efficiency Being Violated?. IJEEP [Internet]. 2023 Jan. 22 [cited 2024 May 5];13(1):118-27. Available from: https://www.econjournals.com/index.php/ijeep/article/view/13453