Peter U. Eze and  P. Udaya and  Robin J. Evans,  Medical Image Watermark and Tamper Detection Using Constant Correlation Spread Spectrum Watermarking.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2018, vol. 135(3). 124 - 131
    [viewed 18 November 2019]. Available from: https://publications.waset.org/pdf/10008924.