TY  - JOUR
AU  - M. M. Vinogradov
TI  - Extensions of fields and extensions of linear differential operators
JO  - Matematičeskie zametki
PY  - 1981
SP  - 237
EP  - 248
VL  - 30
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1981_30_2_a9/
LA  - ru
ID  - MZM_1981_30_2_a9
ER  -