WASET
    Saeid Saryazdi and  Hossein Nezamabadi-pour,  A Blind Digital Watermark in Hadamard Domain.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2007, vol. 3(3). 794 - 797
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9015.