ALTINKAYA, Şahsene, and Sibel YALÇIN. “Faber Polynomial Coefficient Bounds for a Subclass of Bi-Univalent Functions”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 61, no. 1, Mar. 2016, pp. 37-44, https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5508.