Iman A. Saad and  Loay E. George,  Iris Recognition Based On the Low Order Norms of Gradient Components.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2014, vol. 92(8). 1356 - 1362
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/9999069.