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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 5, pp. 558–562, September–October, 1985.
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Busovskaya, O.A. A geometric characteristic of subclasses of univalent functions. Ukr Math J 37, 449–453 (1985). https://doi.org/10.1007/BF01061165
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DOI: https://doi.org/10.1007/BF01061165