@article{IM2_1968_2_5_a10,
     author = {A. L. Belopol'skii and M. Sh. Birman},
     title = {The existence of wave operators in scattering theory for pairs of},
     journal = {Izvestiya. Mathematics},
     pages = {1117--1130},
     year = {1968},
     volume = {2},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_5_a10/}
}