@article{ELA_2006__15__a11,
     author = {Huang, Ting-Zhu and Zhang, Wei and Shen, Shu-Qian},
     title = {Regions containing eigenvalues of a matrix},
     journal = {The electronic journal of linear algebra},
     pages = {215--224},
     publisher = {mathdoc},
     volume = {15},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2006__15__a11/}
}