CALDAS, M. . Certain types of functions via $\boldsymbol{\beta\theta}$-open sets. Sarajevo Journal of Mathematics, [S. l.], v. 13, n. 1, p. 105–113, 2017. DOI: 10.5644/SJM.13.1.08. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/108. Acesso em: 15 oct. 2024.