PatilA. B., and ShabaT. G. “Sharp Initial Coefficient Bounds and the Fekete–Szegö Problem for Some Certain Subclasses of Analytic and Bi-Univalent Functions”. Ukrains’kyi Matematychnyi Zhurnal 75, no. 2 (March 2, 2023): 198 - 206. Accessed December 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/6602.