%0 Journal Article %A G. I. Èskin %T The variation-difference method of solution of elliptic pseudodifferential equations %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1973 %V 28 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1973_28_5_a24/ %G ru %F RM_1973_28_5_a24