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Existence of periodic solutions for a kind of second-order neutral functional differential equation. (English) Zbl 1059.34043
The authors discuss the existence of periodic solutions for a kind of second-order neutral differential equation (NDE), and give several new results on the existence of periodic solutions by means of the continuation theorem of the coincidence degree theory. For discussion of periodic solutions for $$p$$th-order delayed NDEs, we refer to G. He and J. Cao [Appl. Math. Comput. 129, No. 2–3, 391–405 (2002; Zbl 1035.34077) and Appl. Math. Comput. 132, No. 2–3, 231–248 (2002; Zbl 1034.34083)].

##### MSC:
 34K13 Periodic solutions to functional-differential equations 34K40 Neutral functional-differential equations
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##### References:
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