Knoetze, L., N. Olivier, and S. Janse van Vuuren. “Determining the Algal Composition Along a Pollution Gradient in the Vaal River”. Suid-Afrikaans Tydskrif vir Natuurwetenskap en Tegnologie / <i>South African Journal of Science and Technology</i&gt; 32, no. 1 (December 19, 2013): 1 page. Accessed December 22, 2024. http://satnt.co.za/index.php/satnt/article/view/403.