Abstract
In this paper we show the existence of a maximal and a minimal almost periodic solution of a non-autonomous functional differential equation using the method of lower and upper solutions.
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Abbas, S., Bahuguna, D. Almost periodic solutions of a functional differential equation by monotone iterative method. Differ Equ Dyn Syst 16, 47–62 (2008). https://doi.org/10.1007/s12591-008-0004-4
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DOI: https://doi.org/10.1007/s12591-008-0004-4