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The author gratefully acknowledges partial support from the Swedish Natural Science Research Council (NFR) under contract nr F 2234-012, and from the Centre National de la Recherche Scientifique under the ATP franco-suédoise.
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Hedberg, L.I. Two approximation problems in function spaces. Ark. Mat. 16, 51–81 (1978). https://doi.org/10.1007/BF02385982
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DOI: https://doi.org/10.1007/BF02385982