@article{etna_vol30_pp398-405, author = {Richard S. Varga and Ljiljana Cvetkovi\'c and Vladimir Kosti\'c}, title = {Approximation of the minimal Ger\v{s}gorin set of a square complex matrix}, journal = {Electron. Trans. Numer. Anal.}, volume = {30}, year = {2008}, pages = {398--405}, }