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On the existence of periodic solutions of z’(t)=-az(t-r+uk(t,z(t)))+F(t). (English) Zbl 0184.12101

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[1] Cooke, K.L, Functional differential systems: some models and perturbation problems, () · Zbl 0189.40301
[2] Hale, J.K, Periodic and almost periodic solutions of functional-difference equations, Arch. rat. mech. anal., 15, (1964) · Zbl 0129.06006
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[12] {\scStephan, B. H.}, Asymptotic behavior of a functional differential equation with bounded lag. SIAM J. App. Math. To appear.
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