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Most of the results in this paper are contained in the first author’s Ph.D. dissertation.
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Feng, J., Macgregor, T.H. Estimates on integral means of the derivatives of univalent functions. J. Anal. Math. 29, 203–231 (1976). https://doi.org/10.1007/BF02789979
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DOI: https://doi.org/10.1007/BF02789979