@article{GDZPPN001171135, title = {A Note on G-Generating Families and Isolated Gerschgorin Disks.}, journal = {Numerische Mathematik}, volume = {21}, year = {1973}, pages = {93-95}, zbl = {0255.65022}, url = {http://dml.mathdoc.fr/item/GDZPPN001171135} }
Medley, H.I. A Note on G-Generating Families and Isolated Gerschgorin Disks.. Numerische Mathematik, Tome 21 (1973) pp. 93-95. http://gdmltest.u-ga.fr/item/GDZPPN001171135/