E Rava, E Chirwa, P Allison, M van Niekerk, and MP Augustyn. 2016. “The Use of Exogenous Microbial Species to Enhance the Performance of a Hybrid Fixed-Film Bioreactor Treating Coal Gasification Wastewater to Meet Discharge Requirements”. Water SA 42 (3 July). https://doi.org/10.4314/wsa.v42i3.14.