@article{TMF_2005_144_3_a6,
     author = {G. R. Yodgorov and M. I. Muminov},
     title = {Spectrum of a {Model} {Operator} in the {Perturbation} {Theory} of the {Essential} {Spectrum}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {544--554},
     publisher = {mathdoc},
     volume = {144},
     number = {3},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2005_144_3_a6/}
}