@article{DAN_1967_172_2_a9,
     author = {N. K. Nikol'skii},
     title = {Unicellularity and non-unicellularity of weighted shift operators},
     journal = {Doklady Akademii Nauk},
     pages = {287--290},
     year = {1967},
     volume = {172},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_172_2_a9/}
}