WASET
    Sanghoon Kim and  Sun-Tae Chung and  Souhwan Jung and  Seongwon Cho,  An Improved Illumination Normalization based on Anisotropic Smoothing for Face Recognition.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2008, vol. 13(1). 1 - 7
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/3973.