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This work was supported in part by the National Science Foundation grant NSF GP 6891 at the University of Maryland and by the Air Force contract AF 49 (638) 1345 at Stanford University.
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Hummel, J.A., Schiffer, M. Coefficient inequalities for Bieberbach-Eilenberg functions. Arch. Rational Mech. Anal. 32, 87–99 (1969). https://doi.org/10.1007/BF00247675
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DOI: https://doi.org/10.1007/BF00247675