BANAKH, Taras; STELMAKH, Yarnya. Examples of Strongly Rigid Countable (Semi)Hausdorff Spaces. Topology Proceedings, [S. l.], v. 62, p. 179–196, 2023. Disponível em: https://www.topologyproceedings.org/index.php/tp/article/view/104. Acesso em: 30 jun. 2026.