@article{FAA_1984_18_1_a21,
     author = {V. A. Khatskevich},
     title = {Invariant subspaces and properties of the spectra of plus-operators with a quasifocusing power in a {Krein} space},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {86--87},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1984_18_1_a21/}
}