P. REVATHI, B. MEERA DEVI, O.RAVI. Near and Closer Relations Via ?-Open Sets. Mathematical Statistician and Engineering Applications, [S. l.], v. 70, n. 2, p. 1509–1523, 2021. DOI: 10.17762/msea.v70i2.2411. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/2411. Acesso em: 10 may. 2024.