Zaied, B.K., M.N.I. Siddique, A.W. Zularisam, M.F. Ahmad, and Y.M. Salih. “Biomethane Production from Anaerobic Codigestion of Palm Oil Mill Effluent With Cattle Manure: A Review”. Asian Journal of Chemistry 31, no. 11 (September 28, 2019): 2413–2424. Accessed May 20, 2024. https://asianpubs.org/index.php/ajchem/article/view/31_11_1.