Nguyen, Hung, Huong Nguyen, Vu Doan, and Thang Vu. 2009. “APPLICATION BIOGAS FOR SMALL GENERATOR’S ENGINE IN VIETNAMESE CONTRYSIDE”. VNUHCM Journal of Science and Technology Development 12 (14), 5-11. https://doi.org/https://doi.org/10.32508/stdj.v12i14.2334.