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 Sciences, [S. l.], v. 32, n. 2, p. 62–70, 2019. DOI: 10.30526/32.2.2140. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/2140.. Acesso em: 1 may. 2024.