@article{MZM_1994_56_4_a11,
     author = {O. G. Parfenov},
     title = {Bernstein widths for some classes of analytic functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {123--131},
     publisher = {mathdoc},
     volume = {56},
     number = {4},
     year = {1994},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_4_a11/}
}