TY  - JOUR
AU  - T. V. Elina
TI  - The best approximation of convolution-type operator on the class of doubly differentiable functions
JO  - Trudy Instituta matematiki i mehaniki
PY  - 1992
SP  - 70
EP  - 78
VL  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TIMM_1992_2_a6/
LA  - ru
ID  - TIMM_1992_2_a6
ER  -