@article{TIMM_2020_26_4_a18,
     author = {M. Sh. Shabozov and {\CYRO}. {\CYRA}. Jurakhonov},
     title = {Upper estimates for best mean-square approximations for some classes of bivariate functions by {Fourier-Chebyshev} sums},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {268--278},
     year = {2020},
     volume = {26},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2020_26_4_a18/}
}