BHARDWAJ, Manoj; OSIPOV, Alexander V. Some observations on a clopen version of the Rothberger property. CUBO, A Mathematical Journal, [S. l.], p. 161–172, 2023. DOI: 10.56754/0719-0646.2502.161. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/3417. Acesso em: 27 nov. 2025.