TY  - JOUR
AU  - M. V. Deikalova
TI  - Several extremal approximation problems for the characteristic function of a~spherical layer
JO  - Trudy Instituta matematiki i mehaniki
PY  - 2011
SP  - 122
EP  - 135
VL  - 17
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TIMM_2011_17_3_a13/
LA  - ru
ID  - TIMM_2011_17_3_a13
ER  -