KAHLIG, Peter; MATKOWSKI, Janusz. On some extensions of the Gołąb-Schinzel functional equation. Annales Mathematicae Silesianae, [S. l.], v. 8, p. 13–31, 1994. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14214. Acesso em: 7 may. 2025.