%0 Journal Article
%T Joint sessions of the Petrovskii Seminar on differential equations and mathematical problems of physics and of the Moscow Mathematical Society
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1981
%V 36
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1981_36_4_a7/
%G ru
%F RM_1981_36_4_a7