POLAK, L.; KOTULSKI, Z. Sending hidden data through WWW pages: detection and prevention Engineering. Engineering Transactions, [S. l.], v. 58, n. 1-2, p. 75–89, 2014. Disponível em: https://et3.ippt.pan.pl/index.php/et/article/view/169. Acesso em: 10 jun. 2025.