%0 Journal Article
%A F.E. BROWDER
%T On the spectcral theory of elliptic differential operators. I.
%J Mathematische Annalen
%D 1961
%P 22-130
%V 142
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1961__142_160823/
%F MAN_1961__142_160823