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Existence theorems of periodic solutions for second-order difference equations containing both advance and retardation. (English) Zbl 1351.39010

J. Contemp. Math. Anal., Armen. Acad. Sci. 51, No. 2, 58-67 (2016) and Izv. Nats. Akad. Nauk Armen., Mat. 51, No. 2, x-x (2016).
MSC:  39A23 39A10
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