Tіmоkhоvіch V. L. On one property of spaces admitting a perfect mapping onto the metric ones . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 1, p. 43–48, 1970. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8477. Acesso em: 6 dec. 2025.