@article{ZNSL_1976_56_a4,
     author = {V. I. Matsaev and E. Z. Mogulski},
     title = {The completeness of weak perturbation of the selfadjoint operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {90--103},
     publisher = {mathdoc},
     volume = {56},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_56_a4/}
}