SABLIK, Maciej. Differentiable solutions of functional equations in Banach spaces. Annales Mathematicae Silesianae, [S. l.], v. 7, p. 17–55, 1993. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14244. Acesso em: 4 jul. 2025.