New Kinds of Open Sets. Journal of the College of Basic Education, [S. l.], v. 17, n. 72, p. 13–18, 2019. DOI: 10.35950/cbej.v17i72.4493. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/4493.. Acesso em: 20 apr. 2025.