@article{MAN_1975__217_162776,
     author = {William C. Lyford},
     title = {A {Two} {Hilbert} {Space} {Scattering} {Theorem.}},
     journal = {Mathematische Annalen},
     pages = {257--262},
     publisher = {mathdoc},
     volume = {217},
     year = {1975},
     zbl = {0323.47006},
     url = {http://geodesic.mathdoc.fr/item/MAN_1975__217_162776/}
}