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This work is part of the author's doctoral thesis, accepted by the Department of Mathematics at the Free University of Berlin in 1984
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Koepf, W. On nonvanishing univalent functions with real coefficients. Math Z 192, 575–579 (1986). https://doi.org/10.1007/BF01162704
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DOI: https://doi.org/10.1007/BF01162704