@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/