Suyitno, Suyitno, Wibawa Endra Juwana, and Mohamad Muqoffa. “Enhancing Biogas Production through the Co-Digestion of Indigofera and Cow Manure for Electricity Generation”. Journal of Engineering and Technological Sciences 57, no. 3 (March 27, 2025): 291–302. Accessed October 20, 2025. https://jets.itb.ac.id/jets/article/view/51.