EL-MONSEF, M. E. A.; KOZAE, A. M. .; KHAORA, A. A. A. ON FILTER EXPANSION OF TOPOLOGIES. Tamkang Journal of Mathematics, [S. l.], v. 25, n. 1, p. 53–59, 1994. DOI: 10.5556/j.tkjm.25.1994.4425. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4425. Acesso em: 5 may. 2024.