@article{DAN_1965_165_4_a1,
     author = {O. V. Besov},
     title = {On the density of finitary functions and the extension of classes of differentiable functions},
     journal = {Doklady Akademii Nauk},
     pages = {738--741},
     publisher = {mathdoc},
     volume = {165},
     number = {4},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_4_a1/}
}