@article{MZM_1969_6_5_a9,
     author = {R. M. Min'kova and Yu. A. Shashkin},
     title = {On the convergence of linear operators of the class $S_m$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {591--598},
     publisher = {mathdoc},
     volume = {6},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_5_a9/}
}