TY  - JOUR
AU  - P. E. Sobolevskii
TI  - First order differential equations in Hilbert space with a variable positively defined self-adjoined operator whose fractional power has a constant definition domain
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 984
EP  - 987
VL  - 123
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_123_6_a7/
LA  - ru
ID  - DAN_1958_123_6_a7
ER  -