TY  - JOUR
AU  - A. I. Bulgakov
TI  - On the oscillation of solutions of systems of second-order differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1987
SP  - 204
EP  - 217
VL  - 23
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1987_23_2_a3/
LA  - ru
ID  - DE_1987_23_2_a3
ER  -