@article{ZNSL_1983_126_a15,
     author = {N. G. Makarov},
     title = {Point unitary spectrum of almost unitary operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {143--149},
     publisher = {mathdoc},
     volume = {126},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_126_a15/}
}