HUSSAIN, Sabir; ROSAS, Ennis. ON γ-s-URYSOHN CLOSED AND γ-s-REGULAR CLOSED SPACES. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 32, p. 49–56, 2014. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/6237. Acesso em: 7 aug. 2026.