Afzel Noore,  An Improved Method to Watermark Images Sensitive to Blocking Artifacts.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2007, vol. 10(10). 3330 - 3335
    [viewed 29 February 2020]. Available from: https://publications.waset.org/pdf/2003.