@article{DAN_1975_223_5_a10,
     author = {V. N. Temlyakov},
     title = {Best approximations for functions of two variables},
     journal = {Doklady Akademii Nauk},
     pages = {1079--1082},
     publisher = {mathdoc},
     volume = {223},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_223_5_a10/}
}