Criterion of periodicity of solutions of a certain differential equation with a periodic coefficient. (English) Zbl 0148.07104

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[1] R. Bellman,Stability theory of differential equations, New York, Toronto, London 1953. · Zbl 0053.24705
[2] L. Cesari,Asymptotic behavior and stability problems in ordinary differential equations, Springer Verlag 1959. · Zbl 0082.07602
[3] Horn, J., Gewönliche Differentialgleichungen (1937), Berlin: Leipzig, Berlin
[4] F. Neuman,Bounded non-periodic solutions of second-order linear differential equations with periodic coefficients, to appear in Canadian Math. J.
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