Patil, A. B., and T. G. Shaba. “Sharp Initial Coefficient Bounds and the Fekete–Szegö Problem for Some Certain Subclasses of Analytic and Bi-Univalent Functions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 75, no. 2, Mar. 2023, pp. 198 -06, doi:10.37863/umzh.v75i2.6602.