TY  - JOUR
AU  - N. P. Korneichuk
TI  - On extremal problems in the theory of best approximation
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1974
SP  - 7
EP  - 43
VL  - 29
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1974_29_3_a2/
LA  - en
ID  - RM_1974_29_3_a2
ER  -