@article{GDZPPN001168002, title = {A Note on a Perturbation Theorem for the Matrix Eigenvalue Problem.}, journal = {Numerische Mathematik}, volume = {13}, year = {1969}, pages = {152-153}, zbl = {0186.05703}, url = {http://dml.mathdoc.fr/item/GDZPPN001168002} }
OSBORN, J.E. A Note on a Perturbation Theorem for the Matrix Eigenvalue Problem.. Numerische Mathematik, Tome 13 (1969) pp. 152-153. http://gdmltest.u-ga.fr/item/GDZPPN001168002/