@article{GDZPPN001169173,
title = {A Note on Gerschgorin's Inclusion Theorem for Eigenvalues of Matrices.},
journal = {Numerische Mathematik},
volume = {15},
year = {1970},
pages = {141-144},
zbl = {0192.36903},
url = {http://dml.mathdoc.fr/item/GDZPPN001169173}
}
VARGA, R.S.; HOUSEHOLDER, A.S.; WILKINSON, J.H. A Note on Gerschgorin's Inclusion Theorem for Eigenvalues of Matrices.. Numerische Mathematik, Tome 15 (1970) pp. 141-144. http://gdmltest.u-ga.fr/item/GDZPPN001169173/