TY  - JOUR
AU  - V. V. Kovtunets
TI  - Differentiability of an operator of best uniform approximation of
JO  - Doklady Akademii Nauk
PY  - 1990
SP  - 548
EP  - 551
VL  - 313
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1990_313_3_a7/
LA  - ru
ID  - DAN_1990_313_3_a7
ER  -