Srimalanon, R. ., and P. . Kachapongkun. “Separating Methane and Carbon Dioxide from Household Biogas”. Journal of Renewable Energy and Smart Grid Technology, vol. 17, no. 1, June 2022, pp. 29-38, https://ph01.tci-thaijo.org/index.php/RAST/article/view/245329.