@article{MZM_1976_20_3_a12,
     author = {R. K. Vasil'ev},
     title = {The order of approximation to functions on sets by polynomial operators in the class $S_m$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {409--416},
     publisher = {mathdoc},
     volume = {20},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_3_a12/}
}