TY  - JOUR
AU  - A. Yu. Levin
TI  - Integral criteria for the equation $\ddot x+q(t)x=0$ to be nonoscillatory
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1965
VL  - 20
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1965_20_2_a21/
LA  - ru
ID  - RM_1965_20_2_a21
ER  -