@article{NUMA_1968__11_131830,
     author = {R.S. VARGA and H.I. MEDLEY},
     title = {On {Smallest} {Isolated} {Gerschgorin} {Disks} for {Eigenvalues.} {II.}},
     journal = {Numerische Mathematik},
     pages = {320--323},
     publisher = {mathdoc},
     volume = {11},
     year = {1968},
     zbl = {0164.17604},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1968__11_131830/}
}