MathSciNet bibliographic data MR833704 (87d:30028) 30C75 (30D50) Horwitz, A.; Newman, D. J. An extremal problem for analytic functions with prescribed zeros and $r$$r$th derivative in $H\sp \infty$$H\sp \infty$. Trans. Amer. Math. Soc. 295 (1986), no. 2, 699–713. Article

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