LEISCHNER, P. Thébaultův problém 3887. Matematika–Fyzika–Informatika, [S. l.], v. 27, n. 4, p. 241–251, 2018. Disponível em: http://158.194.80.143/index.php/mfi/article/view/410. Acesso em: 13 led. 2025.