Noorbatcha, Ibrahim, Khalit Mohamad, Omobuwajo O.R, and Khalijah Awang. 2005. “Computer Modeling Studies of Apotirucallane Triterpenes in Solution”. Malaysian Journal of Science 24 (2):117-23. https://malindojournal.um.edu.my/index.php/MJS/article/view/8367.