@article{DAN_1966_168_5_a9,
     author = {V. I. Oseledets},
     title = {The spectrum of ergodic automorphisms},
     journal = {Doklady Akademii Nauk},
     pages = {1009--1011},
     year = {1966},
     volume = {168},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_5_a9/}
}