Maha Sharkas and  Dahlia ElShafie and  Nadder Hamdy,  A Dual Digital-Image Watermarking Technique.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2007, vol. 5(5). 1477 - 1480
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/12060.