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Annales Polonici Mathematici · 1990 · 58 citations · 0 references
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Natural SciencesMathematicsDifferential EquationsDynamical SystemsBoundary ConditionsBoundary-value ProblemsEigenvalue ProblemsNonlinear DynamicsPerturbation TheorySpectral TheoryNonlinear Eigenvalue ProblemsNonlinear ResonanceNonlinear Spectral Problems