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@article{DAN_1962_144_2_a7, author = {I. V. Stankevich}, title = {On the perturbation theory of a continuous spectrum}, journal = {Doklady Akademii Nauk}, pages = {279--282}, publisher = {mathdoc}, volume = {144}, number = {2}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1962_144_2_a7/} }
I. V. Stankevich. On the perturbation theory of a continuous spectrum. Doklady Akademii Nauk, Tome 144 (1962) no. 2, pp. 279-282. http://geodesic.mathdoc.fr/item/DAN_1962_144_2_a7/