Steyn, Marilize, and Gerrit Kornelius. “‘An Economic Assessment of SO2 Reduction from Industrial Sources on the Highveld of South Africa’ by Steyn and Kornelius”. Clean Air Journal 28, no. 2 (November 30, 2018). Accessed April 25, 2024. https://cleanairjournal.org.za/article/view/6902.