@article{RM_1962_17_1_a6,
     author = {L. I. Bausov},
     title = {The order of approximation of functions of class~$Z_\alpha$ by positive linear polynomial operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     publisher = {mathdoc},
     volume = {17},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1962_17_1_a6/}
}