@article{AA_2001_13_5_a2,
     author = {V. V. Kapustin},
     title = {Spectral analysis of almost unitary operators},
     journal = {Algebra i analiz},
     pages = {44--68},
     publisher = {mathdoc},
     volume = {13},
     number = {5},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2001_13_5_a2/}
}