TY  - JOUR
AU  - A. I. Vol'pert
TI  - Investigation of boundary problems for elliptical systems of differential equations on a plane
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 462
EP  - 464
VL  - 114
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_114_3_a2/
LA  - ru
ID  - DAN_1957_114_3_a2
ER  -