Markus Lenhart, M. L., M. P. Marcel Pohl, and J. S. Jan Sprafke. “Challenges and Potential of Anaerobic Digestion from Municipal and Agricultural Organic Waste in Ethiopia”. Ethiopian Journal of Applied Science and Technology, June 2023, pp. 33 -41, https://journals.ju.edu.et/index.php/ejast/article/view/4545.