%0 Journal Article
%T Joint sessions of the Petrovskii Seminar on differential equations and mathematical problems of physics and of the Moscow Mathematical Society (ninth meeting, January~20--23,~1986)
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1986
%V 41
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1986_41_4_a12/
%G ru
%F RM_1986_41_4_a12