TY  - JOUR
AU  - M. K. Chernishov
TI  - Invertibility of first-order linear differential operators
JO  - Matematičeskie zametki
PY  - 1998
SP  - 796
EP  - 800
VL  - 64
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1998_64_5_a18/
LA  - ru
ID  - MZM_1998_64_5_a18
ER  -