Galib Atshan W, Kalf Kazim S. On Differential Sandwich Theorems of Multivalent Functions Defined by a Linear operar. JQCM [Internet]. 28Jan.2019 [cited 30Aug.2021];11(1):Math Page 117 -123. Available from: http://www.qu.edu.iq/journalcm/index.php/journalcm/article/view/480