%0 Journal Article
%A H.O. Cordes
%T Self-Adjointness of Powers of Elliptic Operators on Non-Compact Manifolds.
%J Mathematische Annalen
%D 1971
%P 257-272
%V 195
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1971__195_162229/
%F MAN_1971__195_162229