Journal of Differential Equations · 1989 · 67 citations · 13 references
Natural SciencesPhysicsDynamical SystemsFinite Element AnalysisBoundary ConditionsBoundary-value ProblemsEigenvalue ProblemsOperator TheoryPartial Differential EquationsPerturbation TheoryEigenfunction ExpansionsNeumann Boundary ConditionsNeumann ProblemsSingular Boundary-value ProblemsSingularly Perturbed Boundary Value Problems
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