@article{01214039,
title = {Spectrum stability of an elliptic operator to domain perturbations.},
journal = {Journal of Convex Analysis},
volume = {5},
year = {1998},
pages = {19-30},
zbl = {0919.49014},
language = {en},
url = {http://dml.mathdoc.fr/item/01214039}
}
Bucur, Dorin; Zolésio, Jean-Paul. Spectrum stability of an elliptic operator to domain perturbations.. Journal of Convex Analysis, Tome 5 (1998) pp. 19-30. http://gdmltest.u-ga.fr/item/01214039/