Fransiscus, Yunus, and Tuani L. Simangunsong. 2021. “Anaerobic Digestion of Industrial Tempeh Wastewater With Sludge from Cow Manure Biogas Digester As Inoculum: Effect of F M Ratio on the Methane Production”. International Journal on Advanced Science, Engineering and Information Technology 11 (3):1007-13. https://doi.org/10.18517/ijaseit.11.3.11846.