Ghazy M.R. Assassa and  Mona F. M. Mursi and  Hatim A. Aboalsamh,  Evolutionary Eigenspace Learning using CCIPCA and IPCA for Face Recognition.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 1292 - 1297
    [viewed 19 April 2021]. Available from: https://publications.waset.org/pdf/12212.