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Work partially supported by CNPq/Brasil.
Work partially supported by CAPES/Brasil.
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Costa, D.G., Oliveira, A.S. Existence of solution for a class of semilinear elliptic problems at double resonance. Bol. Soc. Bras. Mat 19, 21–37 (1988). https://doi.org/10.1007/BF02584819
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DOI: https://doi.org/10.1007/BF02584819