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This work was supported in part by Office of Naval Research Contract Nonr—225 (11) at Stanford University. Reproduction in whole or in part is permitted for any purpose of the United States Government.
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Duren, P.L., Schiffer, M. The theory of the second variation in extremum problems for univalent functions. J. Anal. Math. 10, 193–252 (1962). https://doi.org/10.1007/BF02790308
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DOI: https://doi.org/10.1007/BF02790308