@article{MZM_1975_18_4_a13,
     author = {L. N. Nikol'skaya},
     title = {Criteria for stability of the point spectrum under completely continuous perturbations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {601--607},
     publisher = {mathdoc},
     volume = {18},
     number = {4},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_4_a13/}
}