TY  - JOUR
AU  - M. K. Bugir
TI  - Conditions for the oscillation of equations of the form $L^ku+c(x,u)=f(x)$
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 538
EP  - 541
VL  - 304
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_304_3_a4/
LA  - ru
ID  - DAN_1989_304_3_a4
ER  -