Worawoot Prasitturattanachai and  Kamchai Nuithitikul,  Esterification of Free Fatty Acids in Crude Palm Oil Using Alumina-Doped Sulfated Tin Oxide as a Catalyst.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 527 - 531
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/16397.