MathSciNet bibliographic data MR1147403 47B38 (30D55 47D03) Siskakis, Aristomenis G. The Koebe semigroup and a class of averaging operators on $H\sp p({\bf D})$$H\sp p({\bf D})$. Trans. Amer. Math. Soc. 339 (1993), no. 1, 337–350. Article

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