On Minimal Gerschgorin Sets for Families of Norms.
Numerische Mathematik, Tome 20 (1972), pp. 252-256.

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@article{NUMA_1972__20_132188,
     author = {Richard S. Varga and Bernard W. Levinger},
     title = {On {Minimal} {Gerschgorin} {Sets} for {Families} of {Norms.}},
     journal = {Numerische Mathematik},
     pages = {252--256},
     publisher = {mathdoc},
     volume = {20},
     year = {1972},
     zbl = {0302.65029},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__20_132188/}
}
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Richard S. Varga; Bernard W. Levinger. On Minimal Gerschgorin Sets for Families of Norms.. Numerische Mathematik, Tome 20 (1972), pp. 252-256. http://geodesic.mathdoc.fr/item/NUMA_1972__20_132188/