@article{MZ_1977__155_172555,
     author = {Barry Simon and Michael Reed},
     title = {The {Scattering} of {Classical} {Waves} from {Inhomogeneous} media.},
     journal = {Mathematische Zeitschrift},
     pages = {163--180},
     publisher = {mathdoc},
     volume = {155},
     year = {1977},
     zbl = {0338.35073},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__155_172555/}
}