@article{MZM_1999_65_2_a2,
     author = {S. B. Vakarchuk},
     title = {On the best linear approximation methods and the widths of certain classes of analytic functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {186--193},
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_65_2_a2/}
}