TY  - JOUR
AU  - K. Yu. Osipenko
TI  - Best approximation methods and the order of informativeness of systems
JO  - Sbornik. Mathematics
PY  - 1981
SP  - 479
EP  - 500
VL  - 39
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1981_39_4_a3/
LA  - en
ID  - SM_1981_39_4_a3
ER  -