Admasie, M., T. Temesgen, and F. Kebede. “Production of Biogas from Calabash Waste Mixed in Selected Ratios With Sheep and Donkey Dungs”. Ethiopian Journal of Science and Sustainable Development, Vol. 10, no. 1, Dec. 2022, pp. 7-19, doi:10.20372/ejssdastu:v10.i1.2023.458.