Document Zbl 0247.34048

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Conf. Theory ordinary partial diff. Equ., Dundee/Scotland 1972, Lect. Notes Math. 280, 298-302 (1972).

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scan of Zbl 0247.34048

34C15	Nonlinear oscillations and coupled oscillators for ordinary differential equations
34C25	Periodic solutions to ordinary differential equations
34D15	Singular perturbations of ordinary differential equations

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