Ghosh, G., et al. “Isolation and Characterization of 22,23-Dihydrostigmasterol (β-Sitosterol) from the Bark of Polyalthia Longifolia Var. Angustifolia”. Asian Journal of Chemistry, vol. 23, no. 3, Nov. 2010, pp. 1341-3, https://asianpubs.org/index.php/ajchem/article/view/16114.