purwanto, clinton velly. “EFFECT OF ADDITION OF PALM OIL EMPTY BUNCH ASH ON BIOGAS PRODUCTION FROM PALM OIL MILL EFFLUENT”. Agroindustrial Technology Journal 7, no. 2 (December 15, 2023). Accessed March 14, 2025. https://ejournal.unida.gontor.ac.id/index.php/atj/article/view/9173.