TY  - JOUR
AU  - S. N. Nikolskii
TI  - Jackson's Order of Approximation in the Problem of Approximation of Continuous Set-Valued Map
JO  - Mathematica balkanica
PY  - 1990
SP  - 396
VL  - 4
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MABA_1990_4_3-4_a17/
ID  - MABA_1990_4_3-4_a17
ER  -