@article{MZM_1990_48_3_a4,
     author = {S. B. Vakarchuk},
     title = {Approximations of differentiable functions of several variables},
     journal = {Matemati\v{c}eskie zametki},
     pages = {37--44},
     publisher = {mathdoc},
     volume = {48},
     number = {3},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_3_a4/}
}