KHALIL IBRAHIM, S.; MOHAMMAD HISHAM YOUSIF, W. hiding data in a text using color variance. Journal of Education and Science (JES), [S. l.], v. 26, n. 3, p. 194–215, 2013. DOI: 10.33899/edusj.2013.89907. Disponível em: https://ojs.uomosul.edu.iq/index.php/edusj/article/view/23433. Acesso em: 6 aug. 2025.