KOVTONYUK, D. A. On the theory of hyper-$Q$-homeomorphisms. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 1, p. 139–144, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2850. Acesso em: 5 dec. 2025.