Communications on Pure and Applied Mathematics · 1983 · 2.9K citations · 17 references
Natural SciencesHistoryDifferential EquationsBoundary ConditionsPartial Differential EquationsRegular SolutionsCritical ExponentsElliptic Boundary-value ProblemsElliptic FunctionsElliptic Partial Differential EquationsNondegenerate Critical Points
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Ivar Ekeland · Journal of Mathematical Analysis and Applications · 1974 · 2.3K citations · Full text
Some global results for nonlinear eigenvalue problems
Paul H. Rabinowitz · Journal of Functional Analysis · 1971 · 1.9K citations