Utilization of biogas as a source of electrical energy to support energy independent cages for dairy Cattle Farmers Group Sumber Sari, Ngablak, Magelang. Community Empower [Internet]. 2022 Apr. 15 [cited 2026 Sep. 28];7(3):562-9. Available from: https://journal.unimma.ac.id/ce/article/view/6138