@article{NUMA_1968__12_131852,
     author = {F.L. BAUER},
     title = {Fields of {Values} and {Gershgorin} {Disks.}},
     journal = {Numerische Mathematik},
     pages = {91--95},
     year = {1968},
     volume = {12},
     zbl = {0182.49102},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__12_131852/}
}