%0 Journal Article %A V. P. Il'in %T Properties of certain classes of differentiable functions of several variables defined in an $n$-dimensional domain %J Informatics and Automation %D 1962 %P 227-363 %V 66 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1962_66_a14/ %G ru %F TRSPY_1962_66_a14