Khanduja, Vidhi, Shampa Chakraverty, and Om Prakash Verma. “Watermarking Categorical Data : Algorithm and Robustness Analysis”. Defence Science Journal 65, no. 3 (May 29, 2015): 226–232. Accessed June 15, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/8444.