@article{IM2_1995_45_1_a0,
     author = {A. G. Baskakov},
     title = {Spectral analysis of perturbed nonquasianalytic and spectral operators},
     journal = {Izvestiya. Mathematics },
     pages = {1--31},
     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1995_45_1_a0/}
}