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Communicated by M. M. Schiffer
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Gaier, D., Huckemann, F. Extremal problems for functions schlicht in an annulus. Arch. Rational Mech. Anal. 9, 415–421 (1962). https://doi.org/10.1007/BF00253363
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DOI: https://doi.org/10.1007/BF00253363