Bajracharya, Tri Ratna, Alok Dhungana, Nirajan Thapaliya, and Gogan Hamal. “Purification and Compression of Biogas: A Research Experience”. Journal of the Institute of Engineering 7, no. 1 (July 23, 2009): 90–98. Accessed September 18, 2024. https://nepjol.info/index.php/JIE/article/view/2066.