Obadiah A., Kannan R., Ramasubbu A., and Vasanth Kumar S. “Studies on the Effect of Antioxidants on the Long-Term Storage Stability and Oxidation Stability of Jatropha Biodiesel”. International Journal of Research in Chemistry and Environment (IJRCE), vol. 2, no. 1, Dec. 2011, pp. 130-9, https://ijrce.org/index.php/ijrce/article/view/146.