V. MAHADEVAN. Some Properties of Wa ?-Interior and Wa ?-Closure in Topological Spaces. Mathematical Statistician and Engineering Applications, [S. l.], v. 70, n. 2, p. 2087–2093, 2021. Disponível em: https://philstat.org/index.php/MSEA/article/view/2748. Acesso em: 3 jul. 2024.