%0 Journal Article %A W. Hansen %A H. Hueber %T The Dirichlet Problem for Sublaplacians on Nilpotent Gruops - Geometric Criteria For Regularity. %J Mathematische Annalen %D 1986 %P 537-548 %V 276 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1986__276_164218/ %F MAN_1986__276_164218