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The author was partially supported by Fundo Nacional de Ciências e Tecnologia (FINEP), Brazil.
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Zapata, G. Weighted approximation, Mergelyan's theorem and quasi-analytic classes. Ark. Mat. 13, 255–262 (1975). https://doi.org/10.1007/BF02386207
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DOI: https://doi.org/10.1007/BF02386207