TY  - JOUR
AU  - Ya. A. Roitberg
AU  - Z. G. Sheftel
TI  - Green’s formula and homeomorphism theorems for nonlocal elliptic boundary value problems
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 1059
EP  - 1062
VL  - 201
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_201_5_a12/
LA  - ru
ID  - DAN_1971_201_5_a12
ER  -