Sim, W.C., et al. “Cratoxylum Glaucum and Cratoxylum Arborescens (Guttiferae)- Two Potential Source of Antioxidant Agents”.
Asian Journal of Chemistry
, vol. 23, no. 2, Oct. 2010, pp. 569-72, https://asianpubs.org/index.php/ajchem/article/view/15849.