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Part of this work was carried out with the support of the CNP and the FNRS
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De Figueiredo, D.G., Gossez, JP. Nonresonance below the first eigenvalue for a semilinear elliptic problem. Math. Ann. 281, 589–610 (1988). https://doi.org/10.1007/BF01456841
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DOI: https://doi.org/10.1007/BF01456841