@article{MZM_1982_31_1_a7,
     author = {V. V. Ditkin},
     title = {Certain spectral properties of a pencil of linear bounded operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {75--79},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1982_31_1_a7/}
}