Lourens A, Beukes J, van Zyl P, Fourie G, Burger J, Pienaar J, et al. Spatial and temporal assessment of gaseous pollutants in the Highveld of South Africa. S. Afr. J. Sci. [Internet]. 2011 Jan. 28 [cited 2024 Nov. 23];107(1/2):8 pages. Available from: https://sajs.co.za/article/view/10078