O. RAVI, M. N. . Remarks On - -Closed Sets. Mathematical Statistician and Engineering Applications, [S. l.], v. 70, n. 2, p. 1830–1838, 2021. DOI: 10.17762/msea.v70i2.2538. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/2538. Acesso em: 13 may. 2024.