TY  - JOUR
AU  - A. Yu. Levin
TI  - Some questions on the oscillation of solutions of linear differential equations
JO  - Doklady Akademii Nauk
PY  - 1963
SP  - 512
EP  - 515
VL  - 148
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1963_148_3_a7/
LA  - ru
ID  - DAN_1963_148_3_a7
ER  -