%0 Journal Article
%A N. N. Perelomova
%A A. P. Shirokov
%T Second-order tangent bundles of the projective line, and Lobachevskii geometry
%J Trudy Geometricheskogo Seminara
%D 1990
%P 73-85
%V 20
%I mathdoc
%U http://geodesic.mathdoc.fr/item/KUTGS_1990_20_a8/
%G ru
%F KUTGS_1990_20_a8