BANAKH, T. O. Descriptive classes of sets and topological functors. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 3, p. 408–410, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5431. Acesso em: 5 dec. 2025.