Utilizing Operation in Certain Types of Open Sets A Review. JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences, [S. l.], v. 29, n. 1, p. 1–7, 2021. Disponível em: https://www.journalofbabylon.com/index.php/JUBPAS/article/view/3569. Acesso em: 4 may. 2025.