@article{MZM_1991_49_6_a8,
     author = {S. N. Kudryavtsev},
     title = {Approximations of compact sets of functions by piecewise polynomial surfaces in spaces of smooth functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {72--81},
     publisher = {mathdoc},
     volume = {49},
     number = {6},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_6_a8/}
}