TY  - JOUR
AU  - R. S. Saks
TI  - Weakly elliptic systems of pseudodifferential equations on a manifold without boundary
JO  - Doklady Akademii Nauk
PY  - 1978
SP  - 786
EP  - 789
VL  - 240
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1978_240_4_a7/
LA  - ru
ID  - DAN_1978_240_4_a7
ER  -