Geodesic
A frequency criterion for smoothness, with respect to the parameters, of solutions of a class of linear systems
Differencialʹnye uravneniâ, Tome 33 (1997) no. 7 
B. F. Ivanov. A frequency criterion for smoothness, with respect to the parameters, of solutions of a class of linear systems. Differencialʹnye uravneniâ, Tome 33 (1997) no. 7. http://geodesic.mathdoc.fr/item/DE_1997_33_7_a20/
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     author = {B. F. Ivanov},
     title = {A frequency criterion for smoothness, with respect to the parameters, of solutions of a class of linear systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1001},
     year = {1997},
     volume = {33},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_7_a20/}
}
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