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Berestycki, Henri; Guedes de Figueiredo, Djairo Double resonance in semilinear elliptic problems. (English) Zbl 0468.35043 Commun. Partial Differ. Equations 6, 91-120 (1981). MSC: 35J60 47J05 55M25 47H10 35P99 PDFBibTeX XMLCite \textit{H. Berestycki} and \textit{D. Guedes de Figueiredo}, Commun. Partial Differ. Equations 6, 91--120 (1981; Zbl 0468.35043) Full Text: DOI