%0 Journal Article %A E. N. Marchenko %A N. V. Marchenko %T Sets of points of discontinuity and differentiability of certain operators %J Matematičeskie zametki %D 1971 %P 323-331 %V 9 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a10/ %G ru %F MZM_1971_9_3_a10