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Gauthier, P.M., Paramonov, P.V. Approximation by harmonic functions in theC 1-norm and harmonicC 1-content of compact subsets in ℝn . Math Notes 53, 373–378 (1993). https://doi.org/10.1007/BF01210218
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DOI: https://doi.org/10.1007/BF01210218