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Published online by Cambridge University Press: 20 November 2018
We show that if B is α Blaschke product with nontangential zero set {zk } and 0 < p < 1, 1/2 < αp < 1, then the condition sup0<r<1(l — r) Mp (r, D 1+α B) < ∞ is equivalent to the condition {(1 - |zk |(1/p)-α K α} ∊ l ∞.