Ngamjaroen, Sureerat, Watit Pakdee, and Cattaleeya Pattamaprom. “The Effect of Storage Degradation of Palm- Stearin Biodiesel on Engine Performance and Exhaust Emission”. Science & Technology Asia 15, no. 5 (October 21, 2015): 32–38. Accessed March 29, 2024. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41237.