TY  - JOUR
AU  - S. G. Krein
TI  - On correctness classes for certain boundary problems
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 1162
EP  - 1165
VL  - 114
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_114_6_a6/
LA  - ru
ID  - DAN_1957_114_6_a6
ER  -