@article{GDZPPN001167464, title = {Fields of Values and Gershgorin Disks.}, journal = {Numerische Mathematik}, volume = {11}, year = {1968}, pages = {91-95}, zbl = {0182.49102}, url = {http://dml.mathdoc.fr/item/GDZPPN001167464} }
BAUER, F.L. Fields of Values and Gershgorin Disks.. Numerische Mathematik, Tome 11 (1968) pp. 91-95. http://gdmltest.u-ga.fr/item/GDZPPN001167464/