@article{NUMA_1970__16_132014,
     author = {R.L. JOHNSTON and B.T. SMITH},
     title = {Calculation of {Best} {Isolated} {Gerschgorin} {Discs.}},
     journal = {Numerische Mathematik},
     pages = {22--31},
     publisher = {mathdoc},
     volume = {16},
     year = {1970},
     zbl = {0191.44702},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1970__16_132014/}
}