%0 Journal Article %A V. P. Il'in %T On a~class functions of several real variables %J Zapiski Nauchnykh Seminarov POMI %D 1967 %P 110-168 %V 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1967_5_a3/ %G ru %F ZNSL_1967_5_a3