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@article{DAN_1962_143_3_a2, author = {M. Sh. Birman}, title = {On existence conditions for wave operators}, journal = {Doklady Akademii Nauk}, pages = {506--509}, publisher = {mathdoc}, volume = {143}, number = {3}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_143_3_a2/} }
M. Sh. Birman. On existence conditions for wave operators. Doklady Akademii Nauk, Tome 143 (1962) no. 3, pp. 506-509. http://geodesic.mathdoc.fr/item/DAN_1962_143_3_a2/