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Periodic solutions for higher order differential equations with deviating argument. (English) Zbl 1160.34065
By using a continuation theorem in coincidence degree theory, the author derives some new criteria for the existence of periodic solutions for a higher order differential equations with periodic deviating arguments.

##### MSC:
 34K13 Periodic solutions to functional-differential equations 47N20 Applications of operator theory to differential and integral equations
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##### References:
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