On the existence of nontrivial periodic solutions of differential difference equations
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Publication:805859
zbMath0729.34047MaRDI QIDQ805859
Publication date: 1990
Published in: Chinese Annals of Mathematics. Series B (Search for Journal in Brave)
Periodic solutions to ordinary differential equations (34C25) Functional-differential equations (including equations with delayed, advanced or state-dependent argument) (34K99)
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