O. RAVI, M. N. . Another Generalization of -Closed Sets. Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 12752–12763, 2022. DOI: 10.17762/msea.v71i4.2539. Disponível em: https://philstat.org/index.php/MSEA/article/view/2539. Acesso em: 10 mar. 2026.