@article{DAN_1969_187_3_a8,
     author = {V. \`E. Lyantse},
     title = {The perturbation of a continuous spectrum},
     journal = {Doklady Akademii Nauk},
     pages = {514--517},
     publisher = {mathdoc},
     volume = {187},
     number = {3},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_187_3_a8/}
}