Journal of Differential Equations · 1981 · 118 citations · 6 references
Natural SciencesMathematicsPhysicsDynamical SystemsHamiltonian DynamicsHamiltonian MechanicsHamiltonian SystemsIntegrable SystemsSymplectic GeometryHamiltonian FlowsPeriodic Solutions Of Differential Equations
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A New Approach to Lagrange Multipliers
Frank H. Clarke · Mathematics of Operations Research · 1976 · 502 citations
Normal modes for nonlinear hamiltonian systems
Alan Weinstein · Inventiones mathematicae · 1973 · 378 citations
Periodic Orbits for Convex Hamiltonian Systems
A. J. Weinstein · Annals of Mathematics · 1978 · 245 citations