Souvik Bhattacharyya and  Gautam Sanyal,  Data Hiding in Images in Discrete Wavelet Domain Using PMM.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2010, vol. 44(8). 1276 - 1284
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/9450.