Sasirin Labua, Chalermpol Sriadulphan, Sunattra Sangkong, and Napachalee Puangmalai. “Biodiesel with Decreased Viscosity Produced from Crude Palm Oil”. Agriculture and Natural Resources, vol. 42, no. 5, Dec. 2008, pp. 300-4, https://li01.tci-thaijo.org/index.php/anres/article/view/244610.