@article{GDZPPN001169084,
title = {Calculation of Best Isolated Gerschgorin Discs.},
journal = {Numerische Mathematik},
volume = {15},
year = {1970},
pages = {22-31},
zbl = {0191.44702},
url = {http://dml.mathdoc.fr/item/GDZPPN001169084}
}
JOHNSTON, R.L.; SMITH, B.T. Calculation of Best Isolated Gerschgorin Discs.. Numerische Mathematik, Tome 15 (1970) pp. 22-31. http://gdmltest.u-ga.fr/item/GDZPPN001169084/