ŠTĚPÁNKOVÁ, H. The trick by solving one of the problems of MO. MATHEMATICS–PHYSICS–INFORMATICS, [S. l.], v. 24, n. 5, p. 331–334, 2015. Disponível em: https://mfi.upol.cz/index.php/mfi/article/view/230. Acesso em: 22 nov. 2024.