@article{GDZPPN001167294, title = {On Smallest Isolated Gerschgorin Disks for Eigenvalues. III.}, journal = {Numerische Mathematik}, volume = {11}, year = {1968}, pages = {361-369}, zbl = {0164.17701}, url = {http://dml.mathdoc.fr/item/GDZPPN001167294} }
VARGA, R.S.; MEDLEY, H.I. On Smallest Isolated Gerschgorin Disks for Eigenvalues. III.. Numerische Mathematik, Tome 11 (1968) pp. 361-369. http://gdmltest.u-ga.fr/item/GDZPPN001167294/