GOYAL, N. New Type of Characterizations of Pre-Open (Closed and Continuous) Mappings. Contemporary Mathematics, [S. l.], v. 4, n. 2, p. 335–341, 2023. DOI: 10.37256/cm.4220232886. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/2886. Acesso em: 19 apr. 2024.