@article{DAN_1964_158_1_a10,
     author = {A. G. Sigalov},
     title = {A new algorithm in the theory of perturbations of the continuous spectrum},
     journal = {Doklady Akademii Nauk},
     pages = {49--52},
     year = {1964},
     volume = {158},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_1_a10/}
}