@article{TRSPY_1969_105_a8,
     author = {P. I. Lizorkin and S. M. Nikol'skii},
     title = {Compactness of sets of differentiable functions},
     journal = {Informatics and Automation},
     pages = {168--177},
     publisher = {mathdoc},
     volume = {105},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1969_105_a8/}
}