BRZDĘK, Janusz. On some conditional functional equations of Gołąb-Schinzel type. Annales Mathematicae Silesianae, [S. l.], v. 9, p. 65–80, 1995. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/14208. Acesso em: 5 dec. 2025.