@article{DAN_1992_327_2_a1,
     author = {A. P. Petukhov},
     title = {Approximation of functions by convolution operators in the},
     journal = {Doklady Akademii Nauk},
     pages = {187--190},
     year = {1992},
     volume = {327},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1992_327_2_a1/}
}