BLAŽEK, J.; LEISCHNER, P. Jak souvisí Apolloniovy kružnice s elipsou?. Matematika–Fyzika–Informatika, [S. l.], v. 28, n. 2, p. 81–91, 2019. Disponível em: https://www.mfi.upol.cz/index.php/mfi/article/view/445. Acesso em: 27 dub. 2024.