@article{ZNSL_1986_149_a2,
     author = {A. L. Vol'berg and S. R. Treil'},
     title = {Imbedding theorems for invariant subspaces of backward shift operator.},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {38--51},
     publisher = {mathdoc},
     volume = {149},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_149_a2/}
}