On the Fractional q-Differintegral Operator for Subclasses of Bi-univalent Functions Subordinate to q-Ultraspherical Polynomials. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 18, n. 3, p. 6586, 2025. DOI: 10.29020/nybg.ejpam.v18i3.6586. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/6586. Acesso em: 5 dec. 2025.