Ga, Bui Van, and Bui Thi Minh Tu. “Soot Emission Analysis in Combustion of Biogas Diesel Dual Fuel Engine”. International Journal of Environmental Science & Sustainable Development 2, no. 1 (June 30, 2017): 67–79. Accessed February 7, 2023. https://press.ierek.com/index.php/ESSD/article/view/55.