Feig, Gregor T., Warren R. Joubert, Azwitamisi E. Mudau, and Pedro M.S. Monteiro. “South African Carbon Observations: CO2 Measurements for Land, Atmosphere and Ocean”. South African Journal of Science 113, no. 11/12 (November 29, 2017): 4. Accessed March 3, 2024. https://sajs.co.za/article/view/3852.