@article{MZM_1977_22_4_a16,
     author = {P. V. Ermakov},
     title = {The convergence of some linear operators to functions of class $Z_\alpha$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {601--607},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_4_a16/}
}