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Existence of periodic solutions of differential equations of second order. (English) Zbl 0288.34038

Periodic Orbits, Stability, Resonances, Proc. Symp. Univ. São Paulo, Brasil 1969, 168-175 (1970).

MSC:

34C25 Periodic solutions to ordinary differential equations
34B15 Nonlinear boundary value problems for ordinary differential equations
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