D. H. A. Younis, D. T. Y. Abdalla, and D. A. Y. Abdalla, “Vector Quantization Techniques For Partial Encryption of Wavelet-based Compressed Digital Images”, IJEEE, vol. 5, no. 1, pp. 74–89, May 2009, doi: 10.37917/ijeee.5.1.7.