@article{NUMA_1964__6_131623,
     author = {R.S. VARGA},
     title = {On {Smallest} {Isolated} {Gerschgorin} {Disks} for {Eigenvalues.}},
     journal = {Numerische Mathematik},
     pages = {366--376},
     publisher = {mathdoc},
     volume = {6},
     year = {1964},
     zbl = {0131.14204},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1964__6_131623/}
}