Geodesic
On the question of the structural stability of linear systems of differential equations with almost periodic coefficients
Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 2099-2101 
D. N. Cheban. On the question of the structural stability of linear systems of differential equations with almost periodic coefficients. Differencialʹnye uravneniâ, Tome 13 (1977) no. 11, pp. 2099-2101. http://geodesic.mathdoc.fr/item/DE_1977_13_11_a25/
@article{DE_1977_13_11_a25,
     author = {D. N. Cheban},
     title = {On the question of the structural stability of linear systems of differential equations with almost periodic coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2099--2101},
     year = {1977},
     volume = {13},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_11_a25/}
}
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