%0 Journal Article
%A Daniele Morbidelli
%T Fractional Sobolev norms and structure of Carnot-Carathéodory balls for Hörmander vector fields
%J Studia Mathematica
%D 2000
%P 213-244
%V 139
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/sm-139-3-213-244/
%R 10.4064/sm-139-3-213-244
%G fr
%F 10_4064_sm_139_3_213_244