@article{ELA_2004-2005__12__a0,
     author = {Laffey, Thomas J.},
     title = {Perturbing non-real eigenvalues of nonnegative real matrices},
     journal = {The electronic journal of linear algebra},
     publisher = {mathdoc},
     volume = {12},
     year = {2004-2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2004-2005__12__a0/}
}