EL-MONSEF MEA, KOZAE AM, KHAORA AAA. ON FILTER EXPANSION OF TOPOLOGIES. Tamkang J. Math. [Internet]. 1994 Mar. 1 [cited 2024 May 5];25(1):53-9. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4425