JARCZYK, Witold. On a problem of Z. Daróczy. Annales Mathematicae Silesianae, [S. l.], v. 5, p. 83–90, 1991. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14285. Acesso em: 5 dec. 2025.