LEIDERMAN, Arkady; SZEPTYCKI, Paul. A note on preimages of countable-to-one continuous maps. Topology Proceedings, [S. l.], v. 67, p. 27–38, 2025. Disponível em: https://www.topologyproceedings.org/index.php/tp/article/view/183. Acesso em: 30 jun. 2026.