2018. Coefficient Estimates and Fekete- Szegὅ Inequality for a Subclass of Bi-Univalent Functions Defined by Symmetric Q-Derivative Operator by Using Faber Polynomial Techniques. Periodicals of Engineering and Natural Sciences. 6, 1 (Jun. 2018). DOI:https://doi.org/10.21533/pen.v6.i1.1708.