%0 Journal Article %T In memory of Sergei L'vovich Sobolev %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1990 %P 3-4 %V 192 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1990_192_a0/ %G ru %F TM_1990_192_a0