Korkpoe, Carl H., and Peterson Owusu Junior. “Behaviour of Johannesburg Stock Exchange All Share Index Returns - An Asymmetric GARCH and News Impact Effects Approach”. SPOUDAI Journal of Economics and Business 68, no. 1 (May 2, 2018): 26–42. Accessed October 23, 2024. http://spoudai.org/index.php/journal/article/view/139.