TY  - JOUR
AU  - B. A. Bubnov
TI  - Boundary value problems for a symmetric system of first-order equations
JO  - Doklady Akademii Nauk
PY  - 1976
SP  - 753
EP  - 756
VL  - 226
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1976_226_4_a2/
LA  - ru
ID  - DAN_1976_226_4_a2
ER  -