TY  - JOUR
AU  - V. V. Arestov
TI  - Best approximation ol unbounded operators invariant with respect to a~shift by the linear bounded operators
JO  - Informatics and Automation
PY  - 1992
SP  - 3
EP  - 20
VL  - 198
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1992_198_a0/
LA  - ru
ID  - TRSPY_1992_198_a0
ER  -