S, O., F.H, A., H, H., N.H, F. and M, B. (2005) “Enzymatic Esterification of Betulinic Acid”, Malaysian Journal of Science, 24(1), pp. 97–98. Available at: http://jice.um.edu.my/index.php/MJS/article/view/8937 (Accessed: 25 November 2024).