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Oscillations caused by retarded perturbations of first order linear ordinary differential equations. (English) Zbl 0402.34058

34K99 Functional-differential equations (including equations with delayed, advanced or state-dependent argument)
34K10 Boundary value problems for functional-differential equations
34E10 Perturbations, asymptotics of solutions to ordinary differential equations
34K25 Asymptotic theory of functional-differential equations
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