Ibrahim A. El rube and  Mohamad Abou El Nasr  and  Mostafa M. Naim and  Mahmoud Farouk,  Contourlet versus Wavelet Transform for a Robust Digital Image Watermarking Technique.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 2297 - 2301
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/6996.