Geodesic
The structure of second-order periodic matrix functions having a determinant identically equal to one
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2005), pp. 47-53 
Yu. Ya. Isaenko. The structure of second-order periodic matrix functions having a determinant identically equal to one. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 10 (2005), pp. 47-53. http://geodesic.mathdoc.fr/item/IVM_2005_10_a4/
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     title = {The structure of second-order periodic matrix functions having a determinant identically equal to one},
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     url = {http://geodesic.mathdoc.fr/item/IVM_2005_10_a4/}
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[1] Yakubovich V.A., Starzhinskii V.M., Lineinye differentsialnye uravneniya s periodicheskimi koeffitsientami i ikh prilozheniya, Nauka, M., 1972, 718 pp. | MR

[2] Floquet G., “Sur les equations differentielles lineaires a coefficients periodiques”, Ann. de l'Ecole Normale, 2-e serie, 12 (1883), 47–88 | MR

[3] Lyapunov A.M., Obschaya zadacha ob ustoichivosti dvizheniya, Sobranie sochinenii. T. 2, GITTL, M.–L., 1956, 472 pp.

[4] Isaenko Yu.Ya., “Ob odnom klasse lineinykh periodicheskikh differentsialnykh uravnenii na ploskosti, integriruemykh v konechnom vide”, Differents. i integraln. uravneniya, Tezisy dokladov mezhdunarodnoi nauchnoi konferentsii, Chelyabinsk, 1999, 55