TY  - JOUR
AU  - M. A. Krasnosel'skii
AU  - S. G. Krein
AU  - P. E. Sobolevskii
TI  - On differential equations with unbounded operators in Hilbert space
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 990
EP  - 993
VL  - 112
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_112_6_a2/
LA  - ru
ID  - DAN_1957_112_6_a2
ER  -