@article{ZNSL_1981_113_a6,
     author = {S. N. Naboko},
     title = {Singular spectrum of a~non-self-adjoint operator},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {149--177},
     publisher = {mathdoc},
     volume = {113},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_113_a6/}
}