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To the memory of Charles Pisot
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Goodman, A.W., Schoenberg, I.J. On a theorem of szegö on univalent convex maps of the unit circle. J. Anal. Math. 44, 200–204 (1984). https://doi.org/10.1007/BF02790196
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DOI: https://doi.org/10.1007/BF02790196