Sawyerr, N., Trois, C., Workneh, T. and Okudoh, V. (2019) “An Overview of Biogas Production: Fundamentals, Applications and Future Research”, International Journal of Energy Economics and Policy, 9(2), pp. 105–116. Available at: https://www.econjournals.com/index.php/ijeep/article/view/7375 (Accessed: 25 April 2024).