KHALIL IBRAHIM, S.; MOHAMMAD HISHAM YOUSIF, W. hiding data in a text using color variance. Journal of Education and Science, [S. l.], v. 26, n. 3, p. 194–215, 2013. DOI: 10.33899/edusj.2013.89907. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/41561. Acesso em: 10 sep. 2025.