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Translated from Matematicheskie Zametki, Vol. 53, No. 1, pp. 133–137, January, 1993.
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Yugai, S.M. An estimate of the curvature of the images of circles under maps given by convex univalent functions in a disk. Math Notes 53, 92–95 (1993). https://doi.org/10.1007/BF01208530
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DOI: https://doi.org/10.1007/BF01208530