Fonda, A.; Ramos, M. Large-amplitude subharmonic oscillations for scalar second-order differential equations with asymmetric nonlinearities. (English) Zbl 0798.34048 J. Differ. Equations 109, No. 2, 354-372 (1994). Reviewer: B.Cheshankov (Sofia) MSC: 34C25 PDFBibTeX XMLCite \textit{A. Fonda} and \textit{M. Ramos}, J. Differ. Equations 109, No. 2, 354--372 (1994; Zbl 0798.34048) Full Text: DOI
Fonda, Alessandro; Mawhin, Jean Iterative and variational methods for the solvability of some semilinear equations in Hilbert spaces. (English) Zbl 0761.34047 J. Differ. Equations 98, No. 2, 355-375 (1992). Reviewer: P.Zabreiko (Minsk) MSC: 34G20 35L70 PDFBibTeX XMLCite \textit{A. Fonda} and \textit{J. Mawhin}, J. Differ. Equations 98, No. 2, 355--375 (1992; Zbl 0761.34047) Full Text: DOI