TY  - JOUR
AU  - G. S. Smirnov
TI  - On a~criterion for an element of best $(\alpha,\beta)$-approximation in the space of summable functions
JO  - Informatics and Automation
PY  - 1987
SP  - 201
EP  - 202
VL  - 180
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a122/
LA  - ru
ID  - TRSPY_1987_180_a122
ER  -