%0 Journal Article
%A Georg Still
%T Computable Bounds for Eigenvalues and Eigenfunctions of Elliptic Differential Operators.
%J Numerische Mathematik
%D 1989
%P 201-224
%V 54
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133314/
%F NUMA_1989__54_3_133314