EBRAHIM, Hassan H.; 						AHMED, Ibrahim S..
 On a New Kind of Collection of Subsets Noted by δ–field and Some Concepts  Defined on δ–field.
<strong>Ibn AL- Haitham Journal For Pure and Applied Sciences</strong>, [S.l.], v. 32, n. 2, p. 62-70, may 2019.
ISSN 2521-3407.
Available at: &lt;<a href="https://jih.uobaghdad.edu.iq/index.php/j/article/view/2140" target="_new">https://jih.uobaghdad.edu.iq/index.php/j/article/view/2140</a>&gt;. Date accessed: 14 aug. 2021.
doi: <a href="http://dx.doi.org/10.30526/32.2.2140">http://dx.doi.org/10.30526/32.2.2140</a>.