@article{CMUC_1977__18_3_a16,
     author = {M\"uller, Vladim{\'\i}r},
     title = {On discontinuity of the spectral radius in {Banach} algebras},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {591--598},
     publisher = {mathdoc},
     volume = {18},
     number = {3},
     year = {1977},
     mrnumber = {0500157},
     zbl = {0358.46032},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1977__18_3_a16/}
}