@article{IM2_1968_2_5_a7,
     author = {N. K. Nikol'skii},
     title = {Basicity and unicellularity of weighted shift operators},
     journal = {Izvestiya. Mathematics },
     pages = {1077--1089},
     publisher = {mathdoc},
     volume = {2},
     number = {5},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_5_a7/}
}