S. ASHAEA, G.; 						YOUSIF, Y. Y..
 Filter Bases and j-ω-Perfect Mappings.
<strong>Ibn AL- Haitham Journal For Pure and Applied Science</strong>, [S.l.], v. 32, n. 3, p. 165-177, sep. 2019.
ISSN 2521-3407.
Available at: &lt;<a href="http://jih.uobaghdad.edu.iq/index.php/j/article/view/2289" target="_new">http://jih.uobaghdad.edu.iq/index.php/j/article/view/2289</a>&gt;. Date accessed: 17 nov. 2019.
doi: <a href="http://dx.doi.org/10.30526/32.3.2289">http://dx.doi.org/10.30526/32.3.2289</a>.