BITASOLO, M. N. δ(δg)* - Sets and Functions in Topological Spaces. International Journal For Research In Mathematics And Statistics, [S. l.], v. 5, n. 4, p. 01–08, 2019. DOI: 10.53555/ms.v5i4.833. Disponível em: https://ijfrms.com/index.php/ms/article/view/833. Acesso em: 19 sep. 2025.