A criterion for small change in the direction of the solutions for $n$th order linear differential equations
Differencialʹnye uravneniâ, Tome 11 (1975) no. 2, pp. 246-254.

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     author = {K. A. Dib},
     title = {A criterion for small change in the direction of the solutions for $n$th order linear differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {246--254},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_2_a4/}
}
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K. A. Dib. A criterion for small change in the direction of the solutions for $n$th order linear differential equations. Differencialʹnye uravneniâ, Tome 11 (1975) no. 2, pp. 246-254. http://geodesic.mathdoc.fr/item/DE_1975_11_2_a4/