Srilekha Mukherjee and  Subha Ash and  Goutam Sanyal,  A Differential Calculus Based Image Steganography with Crossover .   journal   = {International Journal of Information and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2015, vol. 100(4). 1049 - 1055
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/10003694.