BĄK, Judyta; KUCHARSKI, Andrzej. Topological spaces with the Freese–Nation property. Annales Mathematicae Silesianae, [S. l.], v. 33, p. 41–54, 2019. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/13649. Acesso em: 3 jul. 2025.