%0 Journal Article %A M. Langenbruch %T Laurent series expansion for solutions of hypoelliptic equations %J Annales Polonici Mathematici %D 2002 %P 277-289 %V 78 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap78-3-6/ %R 10.4064/ap78-3-6 %G fr %F 10_4064_ap78_3_6