Abbas, S., and Z. Ahmad. “Synthesis and Characterization of Thermo Physical Properties of Phthalic Anhydride Glycerol Resin (PAGR) from Soybean Oil”. International Journal of Scientific Research in Chemical Sciences, vol. 6, no. 5, Dec. 2019, pp. 1-6, https://ijsrcs.isroset.org/index.php/j/article/view/52.