Geodesic
Construction of the approached characteristic equations for periodic systems with aftereffect and determinants of perturbation
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 42-43 
Yu. F. Dolgii. Construction of the approached characteristic equations for periodic systems with aftereffect and determinants of perturbation. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2008), pp. 42-43. http://geodesic.mathdoc.fr/item/VUU_2008_2_a13/
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The approximating characteristic equations are proposed for linear periodic systems with aftereffect.

[1] Krasovskii N. N., Nekotorye zadachi teorii ustoichivosti dvizheniya, Fizmatgiz, M., 1959 | MR

[2] Shimanov S. N., “K teorii lineinykh differentsialnykh uravnenii s periodicheskimi koeffitsientami i zapazdyvaniem vremeni”, Prikl. matem. i mekhanika, 27:1 (1963), 450–458 | MR | Zbl

[3] Gokhberg I. Ts., Krein M. G., Vvedenie v teoriyu lineinykh nesamosopryazhennykh operatorov v gilbertovom prostranstve, Nauka, M., 1965 | MR