Poonnakhun, W., P. Suntivarakorn, S. Theragulpisut, and C. Sookkumnerd. “The Effect of Biodiesel on Diesel Engine Performance”. Engineering and Applied Science Research, vol. 33, no. 3, Feb. 2013, pp. 193-08, https://ph01.tci-thaijo.org/index.php/easr/article/view/5991.