@article{DAN_1974_216_4_a7,
     author = {V. I. Lomonosov and Yu. I. Lyubich and V. I. Matsaev},
     title = {Duality of spectral subspaces and conditions for the separation of the spectrum of a bounded linear operator},
     journal = {Doklady Akademii Nauk},
     pages = {737--739},
     publisher = {mathdoc},
     volume = {216},
     number = {4},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_216_4_a7/}
}