Alnajar, O. ., A. Amourah, J. Salah, and M. Darus. “Fekete-Szegö Functional Problem for Analytic and Bi-Univalent Functions Subordinate to Gegenbauer Polynomials”. Contemporary Mathematics, vol. 5, no. 4, Dec. 2024, pp. 5731-42, doi:10.37256/cm.5420245636.