@article{TIMM_2020_26_2_a2,
     author = {V. V. Arestov and A. A. Seleznev},
     title = {Best $L^2${-Extension} of {Algebraic} {Polynomials} from the {Unit} {Euclidean} {Sphere} to a {Concentric} {Sphere}},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {47--55},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2020_26_2_a2/}
}