VOBORNÍK, P. Téměř dokonalá šifra. Matematika–Fyzika–Informatika, [S. l.], v. 23, n. 1, p. 54–69, 2014. Disponível em: http://158.194.80.143/index.php/mfi/article/view/113. Acesso em: 13 led. 2025.