%0 Journal Article
%A Annalisa Baldi
%A Bruno Franchi
%A Maria Carla Tesi
%T Hypoellipticity, fundamental solution and Liouville type theorem for matrix-valued differential operators in Carnot groups
%J Journal of the European Mathematical Society
%D 2009
%P 777-798
%V 11
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4171/jems/166/
%R 10.4171/jems/166
%F JEMS_2009_11_4_a2