TY  - JOUR
AU  - S. M. Ponomarev
TI  - On the theory of boundary value problems for equations of mixed type in three-dimensional domains
JO  - Doklady Akademii Nauk
PY  - 1979
SP  - 1303
EP  - 1306
VL  - 246
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1979_246_6_a4/
LA  - ru
ID  - DAN_1979_246_6_a4
ER  -