@article{GDZPPN001167243, title = {On Smallest Isolated Gerschgorin Disks for Eigenvalues. II.}, journal = {Numerische Mathematik}, volume = {11}, year = {1968}, pages = {320-323}, zbl = {0164.17604}, url = {http://dml.mathdoc.fr/item/GDZPPN001167243} }
VARGA, R.S.; MEDLEY, H.I. On Smallest Isolated Gerschgorin Disks for Eigenvalues. II.. Numerische Mathematik, Tome 11 (1968) pp. 320-323. http://gdmltest.u-ga.fr/item/GDZPPN001167243/