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This work was supported in part by Office of Naval Research Contract Nonr-225(11) at Stanford University.
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Duren, P.L., Schiffer, M. A variational method for functions schlicht in an annulus. Arch. Rational Mech. Anal. 9, 260–272 (1962). https://doi.org/10.1007/BF00253350
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DOI: https://doi.org/10.1007/BF00253350