%0 Journal Article %A Tri, N.M. %T On local properties of some classes of infinitely degenerate elliptic differential operators. %J Rendiconti del seminario matematico %D 2001 %P 277-288 %V 59 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/RSM_2001__59_4_125134/ %G en %F RSM_2001__59_4_125134