TY  - JOUR
AU  - M. Sh. Shabozov
AU  - О. А. Jurakhonov
TI  - Upper estimates for best mean-square approximations for some classes of bivariate functions by Fourier-Chebyshev sums
JO  - Trudy Instituta matematiki i mehaniki
PY  - 2020
SP  - 268
EP  - 278
VL  - 26
IS  - 4
UR  - http://geodesic.mathdoc.fr/item/TIMM_2020_26_4_a18/
LA  - ru
ID  - TIMM_2020_26_4_a18
ER  -