PROTASOV, I. V. Irresolvable topologies on groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 12, p. 1646–1655, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4784. Acesso em: 5 dec. 2025.