Differential equations with almost periodic or conditionally periodic coefficients: Recurrence and reducibility
Matematičeskie zametki, Tome 64 (1998) no. 2, pp. 229-237.

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Recurrence of an individual trajectory of a linear nonautonomous differential equation on a compact Lie group for the case of an almost periodic or conditionally periodic dependence of the right-hand side on time is proved. The relation between recurrence and reducibility is examined.
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N. G. Moshchevitin. Differential equations with almost periodic or conditionally periodic coefficients: Recurrence and reducibility. Matematičeskie zametki, Tome 64 (1998) no. 2, pp. 229-237. http://geodesic.mathdoc.fr/item/MZM_1998_64_2_a9/

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