%0 Journal Article
%A M. D. Kovalev
%T On the curvatures of tangent spheres
%J Informatics and Automation
%D 1991
%P 90-92
%V 196
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_1991_196_a7/
%G ru
%F TRSPY_1991_196_a7