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Let σ denote the class of bi-univalent functions f, that is, both f(z)=z+a₂z²+⋯ and its inverse f⁻¹ are analytic and univalent on the unit disk. We consider the classes of strongly bi-close-to-convex functions of order α a
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Sivasubramanian et al. (2015) studied this question.
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