@article{GDZPPN001170848,
title = {On Minimal Gerschgorin Sets for Families of Norms.},
journal = {Numerische Mathematik},
volume = {19},
year = {1972},
pages = {252-256},
zbl = {0302.65029},
url = {http://dml.mathdoc.fr/item/GDZPPN001170848}
}
Varga, Richard S.; Levinger, Bernard W. On Minimal Gerschgorin Sets for Families of Norms.. Numerische Mathematik, Tome 19 (1972) pp. 252-256. http://gdmltest.u-ga.fr/item/GDZPPN001170848/