@article{ELA_2002__9__a14,
     author = {Rump, Siegfried M.},
     title = {Variational characterizations of the sign-real and the sign-complex spectral radius},
     journal = {The electronic journal of linear algebra},
     pages = {112--117},
     publisher = {mathdoc},
     volume = {9},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2002__9__a14/}
}