Geodesic
Stability of eigenvalues of singular integral equations
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 136-142 
L. N. Nikol'skaya. Stability of eigenvalues of singular integral equations. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 136-142. http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a12/
@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/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

A complex number $\lambda$ is called the stable eigenvalue of an operator $A$ iff $\operatorname{Ker}(A-\lambda I+C)\ne\{\mathbb{O}\}$ for anv coropact operator $C$. In. the article the description is given of the stable- eigenvalues for a class of operators including some classical ones. Besides, there is discussed the stability of the whole point spectrum and the mutual stability of different eigenvalues.