@article{10_21136_CMJ_1962_100539,
     author = {Pt\'ak, Vlastimil},
     title = {Norms and the spectral radius of matrices},
     journal = {Czechoslovak Mathematical Journal},
     pages = {555--557},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1962},
     doi = {10.21136/CMJ.1962.100539},
     mrnumber = {0146190},
     zbl = {0116.25301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1962.100539/}
}