@article{DAN_1978_239_5_a9,
     author = {S. N. Naboko},
     title = {On the separation of spectral subspaces of a nonselfadjoint operator},
     journal = {Doklady Akademii Nauk},
     pages = {1052--1055},
     publisher = {mathdoc},
     volume = {239},
     number = {5},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_239_5_a9/}
}