Hlongwane, Nyiko Worship, and Olebogeng David Daw. “Testing Environmental Kuznets Curve Hold in South Africa: An Econometric Approach”. International Journal of Energy Economics and Policy 12, no. 3 (May 18, 2022): 385–394. Accessed August 31, 2024. https://econjournals.com/index.php/ijeep/article/view/12875.