Ghaffari Moghaddam, M., F.B.H. Ahmad, M. Basri, and M.B. Abdul Rahman. 2012. “Application of the Artificial Neural Network and Response Surface Methodology Models for Predicting the Enzymatic Synthesis of Betulinic Acid Ester: A Comparative Study”. Asian Journal of Chemistry 25 (1):301-5. https://doi.org/10.14233/ajchem.2013.13010.