Characteristic multipliers for some periodic differential equations.

Characteristic multipliers for some periodic differential equations.
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Proc. Amer. Math. Soc. 22 (1969), 503-508 Request permission

References

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Nikolay P. Erugin, Linear systems of ordinary differential equations with periodic and quasi-periodic coefficients, With revisions by the author for the English edition, Mathematics in Science and Engineering, Vol. 28, Academic Press, New York-London, 1966. Translated from the Russian by Scripta Technica, Inc; Translation editor, Richard Bellman. MR 0206356
A. E. Gel′man, The reducibility of a certain class of simultaneous differential equations containing quasiperiodic coefficients, Dokl. Akad. Nauk SSSR (N.S.) 116 (1957), 535–537 (Russian). MR 0094501
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Theory of stability of motion

Michael Golomb, Solution of certain nonautonomous differential systems by series of exponential functions, Illinois J. Math. 3 (1959), 45–65. MR 104874