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References:
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[2] Fučík S., Mawhin J.: Periodic solutions of some nonlinear differential equation of higher order. Čas. Pěst. Mat. 100 (1975), 276-283. MR 0385240
[З] Lasota A., Szafraniec F.H.: Sur les solutions périodique d’une équation différentielle ordinaire d’ordre n. Annal. Polon. Math. 18 (1966), 339-344. MR 0208077
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