%0 Journal Article
%A A. V. Isaev
%T Classification of spherical tube hypersurfaces having two minuses in the Levy signature form
%J Matematičeskie zametki
%D 1989
%P 28-36
%V 46
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1989_46_1_a3/
%G ru
%F MZM_1989_46_1_a3