Noi, Sheriff, Marek Jelínek, and Hynek Roubik. “Small-Scale Biogas Plants in Vietnam: How Are Affected by Policy Issues?”. Ecological Questions 33, no. 4 (August 17, 2022): 1–38. Accessed February 4, 2023. https://apcz.umk.pl/EQ/article/view/38801.