%0 Journal Article
%A N. S. Sinyukov
%A I. N. Kurbatova
%T VIII All-Union scientific conference ``Present-day problems of differential geometry''
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1986
%V 41
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/RM_1986_41_2_a26/
%G ru
%F RM_1986_41_2_a26