%0 Journal Article %A M. S. Agranovich %T Elliptic singular integro-differential operators %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1965 %P 1-121 %V 20 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1965_20_5_a0/ %G en %F RM_1965_20_5_a0