@article{GDZPPN001166735, title = {A Generalization of a Theorem of Fan on Gershgorin Disks.}, journal = {Numerische Mathematik}, volume = {10}, year = {1967}, pages = {162-162}, zbl = {0158.03504}, url = {http://dml.mathdoc.fr/item/GDZPPN001166735} }
STEWART, G.W.III. A Generalization of a Theorem of Fan on Gershgorin Disks.. Numerische Mathematik, Tome 10 (1967) p. 162. http://gdmltest.u-ga.fr/item/GDZPPN001166735/