@article{MZM_1973_13_3_a16,
     author = {R. K. Vasil'ev},
     title = {On the order of an~approximation of functions on sets of positive measure by linear positive polynomial operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {457--468},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_3_a16/}
}