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Entrata in Redazione 18 settembre 1977.
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Castro, A., Lazer, A.C. Critical point theory and the number of solutions of a nonlinear dirichlet problem. Annali di Matematica 120, 113–137 (1979). https://doi.org/10.1007/BF02411940
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DOI: https://doi.org/10.1007/BF02411940