Toihir, Abdoulwahab M., Sivakumar Venkataraman, Nkanyiso Mbatha, Sivakumar K. Sangeetha, Hassan Bencherif, Ernst-Günther Brunke, and Casper Labuschagne. 2015. “Studies on CO Variation and Trends over South Africa and the Indian Ocean Using TES Satellite Data”. South African Journal of Science 111 (9/10): 9. https://doi.org/10.17159/sajs.2015/20140174.