Study of Second Hankel Determinant for Certain Subclasses of Functions Defined by Al-Oboudi Differential Operator. Baghdad Sci.J [Internet]. 2020 Mar. 18 [cited 2024 May 3];17(1(Suppl.):0353. Available from: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/5021