TY  - JOUR
AU  - Yu. Ya. Belov
TI  - Approximation of a~linear system of second-order differential equations
JO  - Matematičeskie zametki
PY  - 1976
SP  - 693
EP  - 702
VL  - 20
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1976_20_5_a7/
LA  - ru
ID  - MZM_1976_20_5_a7
ER  -