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Additional information
This work was done whilst the second author was on leave from the University of York, England, and was a guest of the University of Bonn, Germany, and was supported by the Sonderforschungsbereich 40 (Theoretische Mathematik), Bonn.
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Ruscheweyh, S., Sheil-Small, T. Hadamard products of Schlicht functions and the Pólya-Schoenberg conjecture. Commentarii Mathematici Helvetici 48, 119–135 (1973). https://doi.org/10.1007/BF02566116
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DOI: https://doi.org/10.1007/BF02566116