Geodesic
The instability of the characteristic exponents of systems of linear differential equations with almost periodic coefficients
Differencialʹnye uravneniâ, Tome 8 (1972) no. 5, pp. 795-800 
V. L. Novikov. The instability of the characteristic exponents of systems of linear differential equations with almost periodic coefficients. Differencialʹnye uravneniâ, Tome 8 (1972) no. 5, pp. 795-800. http://geodesic.mathdoc.fr/item/DE_1972_8_5_a7/
@article{DE_1972_8_5_a7,
     author = {V. L. Novikov},
     title = {The instability of the characteristic exponents of systems of linear differential equations with almost periodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {795--800},
     year = {1972},
     volume = {8},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_5_a7/}
}
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