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  • 1 Ankara University Faculty of Sciences Department of Mathematics 06100 Tangodan-Ankara Turkey 06100 Tangodan-Ankara Turkey
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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).