@article{ETNA_2008__31__a11,
     author = {Golub,  Gene H. and Stoll,  Martin and Wathen,  Andy},
     title = {Approximation of the scattering amplitude and linear systems},
     journal = {Electronic transactions on numerical analysis},
     pages = {178--203},
     year = {2008},
     volume = {31},
     zbl = {1188.65032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2008__31__a11/}
}