@article{GDZPPN002311836, title = {A Two Hilbert Space Scattering Theorem.}, journal = {Mathematische Annalen}, volume = {217}, year = {1975}, pages = {257-262}, zbl = {0323.47006}, url = {http://dml.mathdoc.fr/item/GDZPPN002311836} }
Lyford, William C. A Two Hilbert Space Scattering Theorem.. Mathematische Annalen, Tome 217 (1975) pp. 257-262. http://gdmltest.u-ga.fr/item/GDZPPN002311836/