Marais, Anélia, Elmarie Kotzé, Johan Labuschagne, Lientjie Visser, and Craig D. Morris. “Proposed Adaptation of the KMnO4 Oxidation Method for Determining Active Carbon for South African Soils”. South African Journal of Science 116, no. 1/2 (January 29, 2020). Accessed December 3, 2024. https://sajs.co.za/article/view/6443.