GE, Yin. A note on \(\aleph_0\) - spaces. Scientia Series A: Mathematical Sciences, [S. l.], v. 12, p. 1–4, 2006. DOI: 10.71712/. Disponível em: https://revistas.usm.cl/scientia/article/view/75.. Acesso em: 7 jun. 2025.