TY  - JOUR
AU  - V. L. Velikin
TI  - Best approximation in a Banach space by a convergent sequence of subspaces of fixed dimension
JO  - Doklady Akademii Nauk
PY  - 1987
SP  - 23
EP  - 26
VL  - 294
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1987_294_1_a3/
LA  - ru
ID  - DAN_1987_294_1_a3
ER  -