Galib Atshan, Waggas, and Sarah Abd Al-Hmeed Jawad. “On Differential Sandwich Results For Analytic Functions”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 11, no. 1, Jan. 2019, pp. Math Page 96 - 101, doi:10.29304/jqcm.2019.11.1.477.