Konan, Edith Nazo Kpata-, et al. “BIOGAS PRODUCTION FROM ANAEROBIC CO-DIGESTION OF CASSAVA EFFLUENT AND HUMAN URINE”. Pakistan Journal of Biotechnology, vol. 12, no. 2, Mar. 2015, pp. 93-98, https://pjbt.org/index.php/pjbt/article/view/144.