%0 Journal Article %A Golub, Gene H. %A Stoll, Martin %A Wathen, Andy %T Approximation of the scattering amplitude and linear systems %J Electronic transactions on numerical analysis %D 2008 %P 178-203 %V 31 %I mathdoc %U http://geodesic.mathdoc.fr/item/ETNA_2008__31__a11/ %G en %F ETNA_2008__31__a11