P. REVATHI, B. MEERA DEVI. O.RAVI. New Topological Sets Close to ?-Open Sets. Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 12604–12618, 2022. DOI: 10.17762/msea.v71i4.2409. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/2409. Acesso em: 4 mar. 2026.