Mok Jung, Soo. “An Effective Reversible Data Hiding Algorithm Using Huffman Coding and Pixel Value Prediction Algorithm Based on the Similarity Between Adjacent Pixel Values”. International Journal of Engineering & Technology, vol. 7, no. 2.33, June 2018, pp. 182-5, https://doi.org/10.14419/ijet.v7i2.33.13882.