JARCZYK, Witold. On a problem of Z. Daróczy. Annales Mathematicae Silesianae, [S. l.], v. 5, p. 83–90, 1991. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14285. Acesso em: 7 may. 2025.