TY  - JOUR
AU  - I. M. Glazman
TI  - Oscillation theorems for differential equations of higher orders and the spectrum of the respective differential operators
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 423
EP  - 426
VL  - 118
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_118_3_a0/
LA  - ru
ID  - DAN_1958_118_3_a0
ER  -