@article{MMO_1975_33_a1,
     author = {T. Sabirov},
     title = {Some problems in the analytic theory of one-parameter perturbation of linear operators},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {67--106},
     publisher = {mathdoc},
     volume = {33},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1975_33_a1/}
}