@article{ELA_2011__22__a8,
     author = {Kierzkowski, Jakub and Smoktunowicz, Alicja},
     title = {Block normal matrices and gershgorin-type discs},
     journal = {The electronic journal of linear algebra},
     pages = {1059--1069},
     publisher = {mathdoc},
     volume = {22},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2011__22__a8/}
}