Geodesic
Free interpolation in the spaces of analytic functions with derivative of order $s$ in a Hardy space
Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 31, Tome 303 (2003), pp. 169-202 
A. M. Kotochigov. Free interpolation in the spaces of analytic functions with derivative of order $s$ in a Hardy space. Zapiski Nauchnykh Seminarov POMI, Investigations on linear operators and function theory. Part 31, Tome 303 (2003), pp. 169-202. http://geodesic.mathdoc.fr/item/ZNSL_2003_303_a9/
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     title = {Free interpolation in the spaces of analytic functions with derivative of order~$s$ in {a~Hardy} space},
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

We consider the problem of free interpolation for the spaces of analytic functions with derivative of order $s$ in the Hardy space $H^p$. For the sets that satisfy the Stolz condition, we obtain a condition necessary for interpolation: if $1\leq p<\infty$, then the set must be a union of $s$ sparse sets. For $p=\infty$, we obtain a necessary and sufficient condition for interpolation: the set must be a union of $s+1$ sparse sets. In this case, we construct an extension operator.

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