INDIRANI, K. ON b-â„Š-OPEN SETS. Journal of Global Research in Mathematical Archives(JGRMA), [S. l.], v. 1, n. 10, p. 56–62, 2014. Disponível em: https://jgrma.com/index.php/jgrma/article/view/128. Acesso em: 4 jul. 2025.