Geodesic
$C^m$-subharmonic extension of Runge type from closed to open subsets of $\mathbb R^n$
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Analytic and geometric issues of complex analysis, Tome 279 (2012), pp. 219-226.

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We consider several settings for $C^m$-subharmonic extension and $C^m$-harmonic approximation problems of Runge type in Euclidean domains. 
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A. Boivin; P. M. Gauthier; P. V. Paramonov. $C^m$-subharmonic extension of Runge type from closed to open subsets of $\mathbb R^n$. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Analytic and geometric issues of complex analysis, Tome 279 (2012), pp. 219-226. http://geodesic.mathdoc.fr/item/TM_2012_279_a13/

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