TY  - JOUR
AU  - S. S. Ryshkov
TI  - On a mapping of a Hilbert space into itself
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 1042
EP  - 1044
VL  - 141
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_141_5_a9/
LA  - ru
ID  - DAN_1961_141_5_a9
ER  -