GER, Roman. Iteration groups of functions satisfying a generalized additivity equation. Annales Mathematicae Silesianae, [S. l.], v. 13, p. 131–141, 1999. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14143. Acesso em: 7 may. 2025.