Geodesic
Theory of characteristic Lyapunov indices
Matematičeskie zametki, Tome 7 (1970) no. 4, pp. 503-513.

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It is proved that for almost every linear system of differential equations, almost all systems close to it have indices close to its indices. 
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     author = {V. M. Millionshchikov},
     title = {Theory of characteristic {Lyapunov} indices},
     journal = {Matemati\v{c}eskie zametki},
     pages = {503--513},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_4_a15/}
}
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V. M. Millionshchikov. Theory of characteristic Lyapunov indices. Matematičeskie zametki, Tome 7 (1970) no. 4, pp. 503-513. http://geodesic.mathdoc.fr/item/MZM_1970_7_4_a15/