G. Schirripa Spagnolo and  M. De Santis,  Computer Generated Hologram for SemiFragile Watermarking with Encrypted Images.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2008, vol. 23(11). 3829 - 3837
    [viewed 29 January 2020]. Available from: https://publications.waset.org/pdf/8643.