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. Ibn AL- Haitham Journal For Pure and Applied Science, [S.l.], v. 32, n. 2, p. 62-70, may 2019. ISSN 2521-3407. Available at: <http://jih.uobaghdad.edu.iq/index.php/j/article/view/2140>. Date accessed: 19 july 2019. doi: http://dx.doi.org/10.30526/32.2.2140.