@article{ZNSL_1974_39_a4,
     author = {S. N. Naboko},
     title = {On the non selfadjoint {Friedrichs} model},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {40--58},
     year = {1974},
     volume = {39},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_39_a4/}
}