A. Keshavarz,  Propagation of Cos-Gaussian Beam in Photorefractive Crystal.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    November 2015, vol. 108(12). 742 - 745
    [viewed 19 March 2024]. Available from: https://publications.waset.org/pdf/10003206.