@article{DAN_1969_185_2_a8,
     author = {V. S. Ryaben'kii},
     title = {The kernels of the spectra of families of operators},
     journal = {Doklady Akademii Nauk},
     pages = {275--277},
     publisher = {mathdoc},
     volume = {185},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_2_a8/}
}