%0 Journal Article
%A S. A. Shcherbakov
%T The degree of smoothness of horospheres, radial fields, and
%J Doklady Akademii Nauk
%D 1983
%P 1078-1082
%V 271
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1983_271_5_a12/
%G ru
%F DAN_1983_271_5_a12