Ahmad A, Ghufran R, Wahid ZA. Effect of cod loading rate on an upflow anaerobic sludge blanket reactor during anaerobic digestion of palm oil mill effluent with butyrate. JEELM [Internet]. 2012 Nov. 22 [cited 2025 Jul. 3];20(4):256-64. Available from: https://journals.vilniustech.lt/index.php/JEELM/article/view/4645