GUPTA, M. K.; PANT, D. R. An Approach for Image Copyright Protection by using Walsh Hadamard Method. Journal of the Institute of Engineering, [S. l.], v. 12, n. 1, p. 142–168, 2017. DOI: 10.3126/jie.v12i1.16890. Disponível em: https://www.nepjol.info/index.php/JIE/article/view/16890. Acesso em: 29 apr. 2024.