%0 Journal Article %A M. F. Timan %T Difference properties of functions of several variables %J Izvestiya. Mathematics %D 1969 %P 633-642 %V 3 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1969_3_3_a7/ %G en %F IM2_1969_3_3_a7