REICH, Ludwig. Families of commuting formal power series, semicanonical forms and iterative roots. Annales Mathematicae Silesianae, [S. l.], v. 8, p. 189=201, 1994. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14234. Acesso em: 3 jul. 2025.