da Silva Lopes, Wilza, et al. “Evaluation of Acidogenic Sludge from Anaerobic Reactors Running at Low Solids Retention Times to Reduce Sludge Generation and Enhance Biogas Production”. Water SA, vol. 45, no. 4 October, Oct. 2019, doi:10.17159/wsa/2019.v45.i4.7544.