%0 Journal Article %A E. M. Dyn'kin %T On the smoothness of Cauchy type integrals %J Zapiski Nauchnykh Seminarov POMI %D 1979 %P 115-133 %V 92 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1979_92_a6/ %G ru %F ZNSL_1979_92_a6