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This work was supported by DGICYT, Ministry of Education and Science (Spain), under grant number PB92-0941
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Arcoya, D., Villegas, S. Nontrivial solutions for a Neumann problem with a nonlinear term asymptotically linear at −∞ and superlinear at +∞. Math Z 219, 499–513 (1995). https://doi.org/10.1007/BF02572378
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DOI: https://doi.org/10.1007/BF02572378