Mubarick Issahaku, Nana Sarfo Agyemang Derkyi, and Francis Kemausuor, “Operation and Maintenance of Small-Scale Biogas Digesters: Scoping Review and Bibliometric Analysis of Literature”, ASRJETS-Journal, vol. 89, no. 1, pp. 184–215, Sep. 2022, Accessed: Sep. 14, 2025. [Online]. Available: https://asrjetsjournal.org/American_Scientific_Journal/article/view/7884