%0 Journal Article %A A. D. Gadzhiev %T On differentiability properties of the symbol of a~multidimensional singular integral operator %J Sbornik. Mathematics %D 1982 %P 427-450 %V 42 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1982_42_4_a0/ %G en %F SM_1982_42_4_a0