TÖPFER, P. The national round of the 69th year of the Mathematics Olympiad (category P). MATHEMATICS–PHYSICS–INFORMATICS, [S. l.], v. 29, n. 4, p. 316–318, 2020. Disponível em: https://mfi.upol.cz/index.php/mfi/article/view/519. Acesso em: 3 jul. 2024.