Geodesic
The exponential dichotomy of the solutions of equations of hyperbolic type
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 1 
R. K. Romanovskii. The exponential dichotomy of the solutions of equations of hyperbolic type. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 31 (1976) no. 1. http://geodesic.mathdoc.fr/item/RM_1976_31_1_a20/
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     title = {The exponential dichotomy of the solutions of equations of hyperbolic type},
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[1] M. A. Rutman, “Kriterii ogranichennosti reshenii dlya lineinykh differentsialnykh uravnenii s chastnymi proizvodnymi, obladayuschikh starshim chlenom”, DAN, 147:4 (1962), 789–792 | MR | Zbl

[2] Yu. L. Daletskii, M. G. Krein, Ustoichivost reshenii differentsialnykh uravnenii v banakhovom prostranstve, Mir, M., 1970 | MR

[3] R. K. Romanovskii, “Ob ustoichivosti reshenii zadachi Koshi dlya lineinykh differentsialnykh uravnenii giperbolicheskogo tipa”, DAN, 163:5 (1965), 1077–1080 | MR | Zbl