Ndubuisi-Nnaji, U.U., U.A. Ofon, A.E. Asira, N.J. Dickson, and E.E. Benson. “Anaerobic Digestion of Untreated Manure: Environmental Risk Assessment of Resultant Digestates”. World Journal of Applied Science & Technology 14, no. 1b (June 19, 2023): 73–79. Accessed October 17, 2026. https://www.ajol.info/index.php/wojast/article/view/249570.