%0 Journal Article
%A Erik Balslev
%T Discreteness of the Spectrum of a Second Order Elliptic Differential Operator in L2 (rn).
%J Mathematica Scandinavica
%D 1968
%P 42-50
%V 22
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1968__22_166029/
%F MS2_1968__22_166029