TY  - JOUR
AU  - Nguyen Thi Thien Hoa
TI  - The oscillation property of the operator $D(D^2+1^2)\cdots
JO  - Doklady Akademii Nauk
PY  - 1989
SP  - 289
EP  - 293
VL  - 304
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1989_304_2_a6/
LA  - ru
ID  - DAN_1989_304_2_a6
ER  -