FRIPERTINGER, Harald; REICH, Ludwig. Families of commuting formal power series and formal functional equations. Annales Mathematicae Silesianae, [S. l.], v. 35, n. 1, p. 55–76, 2020. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/13474. Acesso em: 5 dec. 2025.