@article{ZNSL_1987_165_a12,
     author = {L. N. Nikol'skaya},
     title = {Stability of eigenvalues of singular integral equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {136--142},
     year = {1987},
     volume = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a12/}
}