@article{RM_1988_43_4_a15,
     author = {S. V. Konyagin and I. G. Tsar'kov},
     title = {On~smoothing of maps in normed spaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {213--214},
     publisher = {mathdoc},
     volume = {43},
     number = {4},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1988_43_4_a15/}
}