@article{DAN_1971_200_3_a9,
     author = {L. A. Sakhnovich},
     title = {On similarity of linear operators},
     journal = {Doklady Akademii Nauk},
     pages = {541--544},
     publisher = {mathdoc},
     volume = {200},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_3_a9/}
}