%0 Journal Article
%T International Conference, dedicated to the 90th anniversary of L. S. Pontryagin birth
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1997
%V 52
%N 4
%U http://geodesic.mathdoc.fr/item/RM_1997_52_4_a24/
%G ru
%F RM_1997_52_4_a24