WASET
    Yan Ma and  ShunBao Li,  The Modified Eigenface Method using Two Thresholds.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2008, vol. 21(9). 3233 - 3236
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/15023.