%0 Journal Article
%T Joint sessions of the Petrovskii Seminar on differential equations and mathematical problems of physics and of the Moscow Mathematical Society (tenth meeting, 19--22 January~1987)
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1987
%V 42
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1987_42_4_a20/
%G ru
%F RM_1987_42_4_a20