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This research was supported in part by an Office of Naval Research contract.
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Beckenbach, E.F. A property of mean values of an analytic function. Rend. Circ. Mat. Palermo 1, 157–163 (1952). https://doi.org/10.1007/BF02847784
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DOI: https://doi.org/10.1007/BF02847784