TY  - JOUR
AU  - T. V. Treneva
TI  - On a four-dimensional not strongly elliptic system
JO  - Differencialʹnye uravneniâ
PY  - 1982
SP  - 351
EP  - 353
VL  - 18
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1982_18_2_a23/
LA  - ru
ID  - DE_1982_18_2_a23
ER  -