@article{01306000,
title = {On Ger\v sgorin-type problems and ovals of cassini.},
journal = {ETNA. Electronic Transactions on Numerical Analysis [electronic only]},
volume = {8},
year = {1999},
pages = {15-20},
zbl = {0927.15008},
language = {en},
url = {http://dml.mathdoc.fr/item/01306000}
}
Varga, Richard S.; Krautstengel, Alan. On Geršgorin-type problems and ovals of cassini.. ETNA. Electronic Transactions on Numerical Analysis [electronic only], Tome 8 (1999) pp. 15-20. http://gdmltest.u-ga.fr/item/01306000/