E Rava, E Chirwa, P Allison, M van Niekerk, and MP Augustyn. “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, no. 3 July (July 29, 2016). Accessed October 7, 2022. https://watersa.net/article/view/10860.