@article{TRSPY_1965_84_a7,
     author = {V. P. Il'in},
     title = {On some properties of classes of differentiable functions defined in a~domain},
     journal = {Informatics and Automation},
     pages = {93--143},
     publisher = {mathdoc},
     volume = {84},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1965_84_a7/}
}