%0 Journal Article
%A John Piepenbrink
%T Finiteness of the Lower Spectrum of Schrödinger Operators.
%J Mathematische Zeitschrift
%D 1974
%P 29-40
%V 140
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1974__140_172128/
%F MZ_1974__140_172128