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The first author was supported by Italian M.P.A. 60% Research funds, University of Salerno
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Cafagna, V., Tarantello, G. Multiple solutions for some semilinear elliptic equations. Math. Ann. 276, 643–656 (1987). https://doi.org/10.1007/BF01456992
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DOI: https://doi.org/10.1007/BF01456992