%0 Journal Article
%A F.L. BAUER
%T An Elementary Proof of the Hopf Inequality for Positive Operators.
%J Numerische Mathematik
%D 1965
%P 331-337
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NUMA_1965__7_131669/
%F NUMA_1965__7_131669