Ayat. Ahmed. Farhan, Alaa. M. F. AL. Jumaili. 2020. “Other Generalized Forms of Separation Axioms in Topological Spaces via E-Open and δ-ß-Open Sets”. PalArch’s Journal of Archaeology of Egypt / Egyptology 17 (9):3887 - 3903. https://www.archives.palarch.nl/index.php/jae/article/view/4518.