%0 Journal Article
%A Martin Costabel
%A Ernst P. Stephan
%T Duality Estimates for the Numerical Solution of Integral Equations.
%J Numerische Mathematik
%D 1989
%P 339-354
%V 54
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NUMA_1989__54_3_133322/
%F NUMA_1989__54_3_133322