LEISCHNER, P. Polibky kružnic: Intermezzo. Matematika–Fyzika–Informatika, [S. l.], v. 24, n. 3, p. 177–184, 2015. Disponível em: http://158.194.80.143/index.php/mfi/article/view/205. Acesso em: 13 led. 2025.