@article{TM_1997_219_a26,
     author = {I. G. Tsar'kov},
     title = {Smoothing of {Functions} on {a~Hilbert} {Ball}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {410--419},
     year = {1997},
     volume = {219},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1997_219_a26/}
}