TY  - JOUR
AU  - V. I. Berdyshev
TI  - Variation of the norms in the problem of best approximation
JO  - Matematičeskie zametki
PY  - 1981
SP  - 181
EP  - 196
VL  - 29
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1981_29_2_a2/
LA  - ru
ID  - MZM_1981_29_2_a2
ER  -