@article{DAN_1964_155_3_a3,
     author = {M. Sh. Birman and S. B. \`Entina},
     title = {A stationary approach in the abstract theory of scattering},
     journal = {Doklady Akademii Nauk},
     pages = {506--508},
     publisher = {mathdoc},
     volume = {155},
     number = {3},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_155_3_a3/}
}