@article{NUMA_1965__7_131648,
     author = {J. TODD},
     title = {On {Smallest} {Isolated} {Gerschgorin} {Disks} for {Eigenvalues.}},
     journal = {Numerische Mathematik},
     pages = {171--175},
     publisher = {mathdoc},
     volume = {7},
     year = {1965},
     zbl = {0148.01703},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1965__7_131648/}
}