TY  - JOUR
AU  - V. I. Gorbaichuk
TI  - An inverse theorem on approximation of functions by operators of extension to a~canonical domain
JO  - Informatics and Automation
PY  - 1987
SP  - 97
EP  - 98
VL  - 180
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a52/
LA  - ru
ID  - TRSPY_1987_180_a52
ER  -