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This work was supported in part by grants from the National Science Foundation.
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Chang, A., Schiffer, M.M. & Schober, G. On the second variation for univalent functions. J. Anal. Math. 40, 203–238 (1981). https://doi.org/10.1007/BF02790163
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DOI: https://doi.org/10.1007/BF02790163