BARON, Karol; SIMON, Alice. On approximate solutions of an iterative functional equation. Annales Mathematicae Silesianae, [S. l.], v. 8, p. 79–84, 1994. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14219. Acesso em: 12 apr. 2025.