Scholes, B., P. Lochner, G. Schreiner, Luanita Snyman-an der Walt, and M. de Jager. “Shale Gas Development in the Central Karoo: A Scientific Assessment of the Opportunities and Risks”. Clean Air Journal 26, no. 2 (December 3, 2016): 6. Accessed April 25, 2024. https://cleanairjournal.org.za/article/view/7002.