Atshan, Waggas Galib, and Rasha Abbas Hadi. “Differential Sandwich Theorems for Univalent Functions Involving a Differential Operator”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 12, no. 1, Mar. 2020, pp. Math Page 108– 119, doi:10.29304/jqcm.2020.12.1.682.