TY  - JOUR
AU  - K. A. Dib
TI  - A criterion for small change in the direction of the solutions for $n$th order linear differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 246
EP  - 254
VL  - 11
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_2_a4/
LA  - ru
ID  - DE_1975_11_2_a4
ER  -