TY  - JOUR
AU  - I. V. Ostrovskii
TI  - A generalization of a theorem stated by M.\,G.~Krein
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 742
EP  - 745
VL  - 116
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_116_5_a6/
LA  - ru
ID  - DAN_1957_116_5_a6
ER  -