Youssef Khmou and  Said Safi and  Miloud Frikel,  Numerical Example of Aperiodic Diffraction Grating.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2016, vol. 120(12). 714 - 719
    [viewed 24 January 2022]. Available from: https://publications.waset.org/pdf/10006777.