Pradhan, Subhalaxmi, et al. “Estimation of Toxic Phorbol Ester in Jatropha Curcas Oil, Cake and Biodiesel”. Asian Journal of Chemistry, vol. 22, no. 5, Mar. 2010, pp. 4069-74, https://asianpubs.org/index.php/ajchem/article/view/11649.