Abdullah KI, Mohammed NH. Estimates of Coefficients for Bi-Univalent Functions in the Subclass H_∑ (n,γ,φ). Tikrit J. Pure Sci. [Internet]. 2023 Aug. 25 [cited 2025 Jun. 17];28(4):80-7. Available from: https://tjpsj.org/index.php/tjps/article/view/1531