TY  - JOUR
AU  - V. I. Paškovskii
TI  - Connected partial differential operators with different principal parts
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 121
EP  - 125
VL  - 13
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_1_a16/
LA  - ru
ID  - DE_1977_13_1_a16
ER  -