@article{10_1017_S0017089512000791,
     author = {CHIAPPINELLI, RAFFAELE and FURI, MASSIMO and PERA, MARIA PATRIZIA},
     title = {PERSISTENCE {OF} {THE} {NORMALIZED} {EIGENVECTORS} {OF} {A} {PERTURBED} {OPERATOR} {IN} {THE} {VARIATIONAL} {CASE}},
     journal = {Glasgow mathematical journal},
     pages = {629--638},
     year = {2013},
     volume = {55},
     number = {3},
     doi = {10.1017/S0017089512000791},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089512000791/}
}