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A. Ambrosetti has written:

'Periodic solutions of singular Lagrangian systems' -- subject(s): Nonlinear oscillations, Differentiable dynamical systems, Critical point theory (Mathematical analysis)

'Perturbation methods and semilinear elliptic problems on R[superscript n]' -- subject(s): Boundary value problems, Differential equations, Elliptic, Elliptic Differential equations, Perturbation (Mathematics)

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10y ago

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