Alicia Y. C. Tang and  Rukaini Hj. Abdullah and  Sharifuddin M. Zain,  Development of a Simulator for Explaining Organic Chemical Reactions Based on Qualitative Process Theory.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2011, vol. 57(9). 748 - 753
    [viewed 29 February 2020]. Available from: https://publications.waset.org/pdf/6021.