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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 16, No. 6, pp. 1286-1296, November–December, 1975.
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Sizhuk, P.I. Regular functions f(z) for which zf'(z) is θ-spiral-like of order α. Sib Math J 16, 986–990 (1975). https://doi.org/10.1007/BF00967396
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DOI: https://doi.org/10.1007/BF00967396