@article{MZM_2011_90_3_a2,
     author = {V. P. Zastavnyi and V. V. Savchuk},
     title = {Approximation of {Classes} of {Convolutions} by {Linear} {Operators} of {Special} {Form}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {351--361},
     publisher = {mathdoc},
     volume = {90},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2011_90_3_a2/}
}