@article{RM_1961_16_5_a1,
     author = {S. M. Nikol'skii},
     title = {On imbedding, continuation and approximation theorems for differentiable functions of several variables},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {55--104},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1961},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_5_a1/}
}