@article{2027, author = {Elsner, L.}, title = {Perturbation theorems for the matrix eigenvalue problem}, journal = {Portugaliae mathematica}, volume = {43}, year = {1985}, pages = {69-76}, zbl = {0579.15007}, mrnumber = {0875054}, language = {en}, url = {http://dml.mathdoc.fr/item/2027} }
Elsner, L. Perturbation theorems for the matrix eigenvalue problem. Portugaliae mathematica, Tome 43 (1985) pp. 69-76. http://gdmltest.u-ga.fr/item/2027/