BANAKH, Iryna; BANAKH, Taras; BAZYLEVYCH, Lidiya. On symmetrizability and perfectness of second-countable spaces. Topology Proceedings, [S. l.], v. 61, p. 233–238, 2022. Disponível em: https://www.topologyproceedings.org/index.php/tp/article/view/110. Acesso em: 30 jun. 2026.