Mubarick Issahaku, Nana Sarfo Agyemang Derkyi, and Francis Kemausuor. “Operation and Maintenance of Small-Scale Biogas Digesters: Scoping Review and Bibliometric Analysis of Literature”. American Scientific Research Journal for Engineering, Technology, and Sciences 89, no. 1 (September 10, 2022): 184–215. Accessed May 17, 2024. https://www.asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/7884.