Abstract
The aim of this paper is to investigate sufficient conditions (Theorem 1) for the nonexistence of nontrivial periodic solutions of equation (1.1) withp ≡ 0 and (Theorem 2) for the existence of periodic solutions of equation (1.1).
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Bereketoglu, H. On the periodic solutions of certain class of seventh-order differential equations. Period Math Hung 24, 13–22 (1992). https://doi.org/10.1007/BF02651083
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DOI: https://doi.org/10.1007/BF02651083