%0 Journal Article
%A Nicola Arcozzi
%A Fausto Ferrari
%T The Hessian of the distance from a surface in the Heisenberg group
%J Annales Fennici Mathematici
%D 2008
%P 35-63
%V 33
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AFM_2008_33_1_a1/
%G en
%F AFM_2008_33_1_a1