@article{IM2_1993_41_3_a4,
     author = {S. G. Merzlyakov},
     title = {Invariant subspaces of the unit shift operator},
     journal = {Izvestiya. Mathematics },
     pages = {489--514},
     publisher = {mathdoc},
     volume = {41},
     number = {3},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1993_41_3_a4/}
}