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, [S. l.], v. 6, n. 1, 2018. DOI: 10.21533/pen.v6.i1.1708. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/1708. Acesso em: 9 jul. 2026.