TY  - JOUR
AU  - V. A. Popov
AU  - Bl. Kh. Sendov
TI  - Classes characterized by best-possible approximation by spline functions
JO  - Matematičeskie zametki
PY  - 1970
SP  - 137
EP  - 148
VL  - 8
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1970_8_2_a1/
LA  - ru
ID  - MZM_1970_8_2_a1
ER  -