Nirunsin, Rotjapun, Worajit Setthapun, Natthawud Dussadee, and Hathaithip Ninsonti. “Enhancement of Household Biogas Production by Solar Collector and Solar Greenhouse”. Journal of Renewable Energy and Smart Grid Technology 12, no. 1 (June 21, 2017): 103–116. Accessed May 7, 2024. https://ph01.tci-thaijo.org/index.php/RAST/article/view/90450.