@article{NUMA_1970__16_132049,
     author = {H.L MEDLEY},
     title = {A {Note} on a {Paper} of {Johnston} and {Smith's} {Concerning} {Best} {Isolated} {Gerschgorin} {Disks.}},
     journal = {Numerische Mathematik},
     pages = {435--441},
     publisher = {mathdoc},
     volume = {16},
     year = {1970},
     zbl = {0198.20901},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1970__16_132049/}
}