NOWAK, Andrzej. A note on the Fréchet theorem. Annales Mathematicae Silesianae, [S. l.], v. 9, p. 43–45, 1995. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14204. Acesso em: 4 jul. 2025.