Aiman Elragig and  Hanan Dreiwi and  Dung Ly and  Idriss Elmabrook,  Principle Components Updates via Matrix Perturbations.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2017, vol. 128(8). 968 - 976
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10007847.