@article{ETNA_1999__8__a9,
     author = {Varga, Richard S. and Krautstengel, Alan},
     title = {On {Ger\v{s}gorin-type} problems and ovals of cassini},
     journal = {Electronic transactions on numerical analysis},
     pages = {15--20},
     publisher = {mathdoc},
     volume = {8},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_1999__8__a9/}
}