Acta Mathematica Vietnamica
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EXISTENCE OF PERIODIC SOLUTIONS OF NONAUTONOMOUS RETARDED FUNCTIONAL DIFFERENTIAL EQUATIONS
E. AIT DADS, K. EZZINBIpp. 25-34
Abstract
This paper is concerned with non-linear functional differential equations of retarded type which are periodic in the independent variable $t$. The aim is to obtain explicit conditions which are sufficient for the existence of periodic solutions if there exists a bounded solution.