@article{MAN_1974__207_162549,
     author = {James S. Howland},
     title = {Stationary {Scattering} {Theory} for {Time-dependent} {Hamiltonians.}},
     journal = {Mathematische Annalen},
     pages = {315--336},
     publisher = {mathdoc},
     volume = {207},
     year = {1974},
     zbl = {0261.35067},
     url = {http://geodesic.mathdoc.fr/item/MAN_1974__207_162549/}
}