Athbanaih, Zainab Aodia. “𝛿−derived and 𝛿−Scattered Sets”. Al-Qadisiyah Journal of Pure Science 20, no. 1 (August 20, 2017): 192-213. Accessed January 18, 2026. https://journalsc.qu.edu.iq.51-77-64-103.cpanel.site/index.php/JOPS/article/view/431.